One of the surprising discoveries of the James Webb Space Telescope (JWST) is that galaxies formed very early in the Universe. JWST has discovered about two dozen galaxies at a redshift of around z = 14, meaning that we see them at a time when the cosmos was just 300-500 million years old. The most distant galaxy, JADES-GS-z14-0, is seen at an age of less than 300 million years. All of these galaxies are rich with stars and have a basic structure similar to what we see in more modern galaxies. This discovery challenged our understanding of galactic evolution. Now a new discovery challenges it even further.
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What's on and in a star? What happens at an active galactic nucleus? Answering those question is the goal of a proposed giant interferometer on the Moon. It's called Artemis-enabled Stellar Imager (AeSI) and would deploy a series of 15-30 optical/ultraviolet-sensitive telescopes in a 1-km elliptical array across the lunar surface.
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In the years since Miguel Alcubierre came up with a warp drive solution in 1994, you would occasionally see news headlines saying that warp drives can work. And then a few months later you'll see that they've been ruled out. And then after that you'll see that warp drives kind of work, but only in limited cases. It seems to constantly go around and around without a clear answer.
What gives?
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There is a supermassive black hole at the center of our galaxy. There is also a lot of other stuff there as well. Young stars, gas, dust, and stellar-mass black holes. It's a happening place. It is also surrounded by a veil of interstellar gas and dust, which means we can't observe the region in visible light. We can observe stars in the region through infrared and radio, and some of the gas there emits radio light, but the stellar-mass black holes remain mostly a mystery.
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Welcome back to our five-part examination of Webb's Cycle 4 General Observations program. In the first and second installments, we examined how some of Webb's 8,500 hours of prime observing time this cycle will be dedicated to exoplanet characterization, the study of galaxies at "Cosmic Dawn," the period known as "Cosmic Noon," and the study of star formation and evolution.
In our final installment, we'll examine programs that leverage Webb's unique abilities to study objects in our cosmic backyard—the Solar System!
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In 1994 Miguel Alcubierre was able to construct a valid solution to the equations of general relativity that enable a warp drive. But now we need to tackle the rest of relativity: How do we arrange matter and energy to make that particular configuration of spacetime possible?
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There are three known types of black holes: supermassive black holes that lurk in the hearts of galaxies, stellar mass black holes formed from stars that die as supernovae, and intermediate mass black holes with masses between the two extremes. It's generally thought that the intermediate ones form from the mergers of stellar mass black holes. If that is true, there should be a forbidden range between stellar and intermediate masses. A range where the mass is too large to have formed from a star but too small to be the sum of mergers. But a new study of data from LIGO suggests that there are black holes in that forbidden range.
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To make a warp drive you have to arrange spacetime so that you never locally travel faster than light but still arrive at your destination…faster than light. And in 1994 Mexican physicist Miguel Alcubierre figured out how.
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The European Space Agency is considering a mission to a metal-rich asteroid. The target is Kleopatra, an M-type asteroid with two moons. These asteroids are relatively common, but they're difficult to observe because they're in the middle and outer regions of the main asteroid belt.
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Firefly Aerospace's Blue Ghost 1 has completed its brief lunar mission. The lander spent two weeks conducting operations on the surface of the Moon before witnessing its final sunset as the Sun dipped below the horizon. This sunset marked the end of the mission, as Blue Ghost lacks the capability to maintain warmth during the freezing cold lunar night. Despite its short operational period, the lander accomplished its objectives, successfully testing all ten NASA payloads, gathering valuable data, and transmitting the findings back to Earth.
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It's ok, Darth Vader hasn't got our humble planet in his sights! No this Death Star is a binary system where both stars are locked into an orbit which will lead to their collision, unleashing a powerful gamma-ray burst when they do. The object, WR104 is otherwise known as the 'Pinwheel Star' due to the presence of a spiral of dust engulfing the system. Recent observations have accurately measured the orientation of the stars and thankfully they're not pointed at the Earth. When they do eventually collide, it'll be someone else's problem.
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It's looking more and more as if dark energy, the mysterious factor that scientists say is behind the accelerating expansion of the universe, isn't as constant as they once thought. The latest findings from the Dark Energy Spectroscopic Instrument, or DESI, don't quite yet come up to the level of a confirmed discovery, but they're leading scientists to rethink their views on the evolution of the universe — and how it might end.
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Somehow, we all know how a warp drive works. You're in your spaceship and you need to get to another star. So you press a button or flip a switch or pull a lever and your ship just goes fast. Like really fast. Faster than the speed of light. Fast enough that you can get to your next destination by the end of the next commercial break.
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Welcome back to our five-part examination of Webb's Cycle 4 General Observations program. In the first and second installments, we examined how some of Webb's 8,500 hours of prime observing time this cycle will be dedicated to exoplanet characterization, the study of galaxies at "Cosmic Dawn," and the period known as "Cosmic Noon."
Today, we'll look at programs that will leverage Webb's unique abilities to study stellar populations and the interstellar medium in galaxies.
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The surfaces of the Moon, Mercury, and Mars are easily visible and are littered with crater impacts. Earth has been subjected to the same bombardment, but geological activity and weathering have eliminated most of the craters. The ones that remain are mostly only faint outlines or remnants. However, researchers in Australia have succeeded in finding what they think is the oldest impact crater on Earth.
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The Extremely Large Telescope (ELT), currently under construction in northern Chile, will give us a better view of the Milky Way than any ground-based telescope before it. It's difficult to overstate how transformative it will be. The ELT's primary mirror array will have an effective diameter of 39 meters. It will gather more light than previous telescopes by an order of magnitude, and it will give us images 16 times sharper than the Hubble Space Telescope. It's scheduled to come online in 2028, and the results could start flooding in literally overnight, as a recent study shows.
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One of the Holy Grails in cosmology is a look back at the earliest epochs of cosmic history. Unfortunately, the Universe's first few hundred thousand years are shrouded in an impenetrable fog. So far, nobody's been able to see past it to the Big Bang. As it turns out, astronomers are chipping away at that cosmic fog by using data from the Atacama Cosmology Telescope (ACT) in Chile.
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One of the Holy Grails in cosmology is a look back at the earliest epochs of cosmic history. Unfortunately, the first few hundred thousand years are shrouded in an impenetrable fog and, so far, nobody's been able to see past it to the Big Bang. As it turns out, astronomers are chipping away at that cosmic fog by using data from the Atacama Cosmology Telescope (ACT) in Chile.
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As civilisations become more and more advanced, their power needs also increase. It's likely that an advanced civilisation might need so much power that they enclose their host star in solar energy collecting satellites. These Dyson Swarms will trap heat so any planets within the sphere are likely to experience a temperature increase. A new paper explores this and concludes that a complete Dyson swarm outside the orbit of the Earth would raise our temperature by 140 K!
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We know that regular supernovae pose no existential threat to life on Earth in the near-term. But there are other varieties of supernova that are a little bit harder to predict, and little bit harder to spot.
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Dark Energy is a mystery so daunting that it stretches and strains our most robust theories. The Universe is expanding, driven by the unknown force that we've named Dark Energy. Dark Energy is also accelerating the rate of expansion. If scientists could figure out why, it would open up a whole new avenue of understanding.
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The ESA's Euclid Space Telescope has already wowed us with some fantastic images. After launching in July 2023, the telescope delivered some stunning first images of the Perseus Cluster, the Horsehead Nebula, and other astronomical objects. Now, the telescope has released its first images of its three Deep Fields.
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The James Webb Space Telescope (JWST) has achieved groundbreaking discoveries in the field of exoplanet studies. In particular, it has made strides in the analysis of their atmospheres by studying light from the parent star as it travels through the gas surrounding the planets. JWST has recently bucked the trend and observed a some gas giant planets in the system HR 8799 and detected the presence of carbon dioxide in their atmospheres, suggesting there are similarities between the formation of this system and our own.
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With luck and clear skies, you can spot Venus crossing between the Earth and the Sun this weekend.
Up for a challenge? If skies are clear, you may be able to complete a rare feat of visual athletics this coming weekend, and follow Venus on its trek from the evening and into the morning sky.
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After an unexpectedly long mission in orbit, astronauts Suni Williams and Butch Wilmore finally arrived home. Their SpaceX Dragon capsule detached from the International Space Station early Tuesday morning, beginning the de-orbiting process. Nick Hague and Aleksandr Gorbunov are also on board and, following a nail biting descent, finally at 7.58pm EDT today.
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The most dangerous parts of a supernova explosion are the outputs like X-rays and gamma rays. Even though they only share a small fraction of a supernova's power, they are extremely dangerous.
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The Square Kilometre Array (SKA) remains under construction with completion still a few years away. However, engineers recently provided an exciting preview having installed 1,024 of the planned 131,072 antennas and capturing a test image of the sky. The image covers about 25 square degrees and reveals 85 of the brightest known galaxies in the region. Once fully operational, the complete array is expected to detect more than 600,000 galaxies within this same area!
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More than one million asteroids larger than 1 km exist in the main asteroid belt (MAB) between Mars and Jupiter. Their roots are in a much smaller number of larger asteroids that broke apart because of collisions, and the MAB is populated with debris fields from these collisions. Researchers have created a geological map of the MAB by tracking meteorites that fell to Earth and determining which of these debris fields they originated in.
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Welcome back to our five-part examination of Webb's Cycle 4 General Observations program. In the first and second installments, we examined how some of Webb's 8,500 hours of prime observing time this cycle will be dedicated to exoplanet characterization and the study of galaxies that existed at "Cosmic Dawn" - ca. less than 1 billion years after the Big Bang.
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We see the Universe through a glass darkly, or more accurately, through a dusty window. Interstellar dust is scattered throughout the Milky Way, which limits our view depending on where we look. In some directions, the effects of dust are small, but in other regions the view is so dusty it's called the Zone of Avoidance. Dust biases our view of the heavens, but fortunately a new study has created a detailed map of cosmic dust so we can better account for it.
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When massive stars explode as supernovae, they can leave behind neutron stars. Other than black holes, these are the densest objects we know of. However, their masses are difficult to determine. New research is making headway.
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The search for life has become one of the holy grails of science. With the increasing number of exoplanet discoveries, astronomers are hunting for a chemical that can only be present in the atmosphere of a planet with life! A new paper suggests that methyl halides, which contain one carbon and three hydrogen atoms, may just do the trick. Here on Earth they are produced by bacteria, algae, fungi and some plants but not by any abiotic processes (non biological.) There is a hitch, detecting these chemicals is beyond the reach of current telescopes.
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The China Space Station Telescope, scheduled for a 2027 launch, will offer astronomers a fresh view on the cosmos. Though somewhat smaller than Hubble, it features a much wider field of view, giving a wide-field surveys that will map gravitational lensing, galaxy clusters, and cosmic voids. Scientists anticipate it will measure dark energy with 1% precision, differentiate between cold and dark matter models, and evaluate gravitational theories.
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From far enough away, most supernovas are benign. But the thing you have to watch out for are the X-rays.
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When water is sprayed or splashed, different size microdroplets develop opposite charges. This "microlightning" could've provided the energy needed to synthesize prebiotic molecules necessary for life.
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Helium-3 (He-3) on the Moon's surface has drawn attention for decades. In 1939, a paper first noted the presence of Helium-3 on the Moon. Still, it really came into the collective consciousness of space resource enthusiasts during the 1980s when they realized just how valuable a resource it was and how much the Moon had of it. Now, a new paper from a company called Interlune, a relatively new start-up based out of Seattle, presented a paper at the recent Lunar and Planetary Science Conference that discusses plans to try to mine some of that wealth of material economically.
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Even tipped over onto its side, the Odysseus Lunar Lander was able to do some science. Though a broken leg means it's doomed to spend eternity in an awkward position, its solar panels were able to gather some energy. Enough for its radiotelescope to take observations for about 80 minutes.
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We are so familiar with our solar system that we often presume it is generally how star systems are built. Four little planets close to the star, four large gas planets farther away, and all with roughly circular orbits. But as we have found ever more exoplanets, we've come to understand just how unusual the solar system is. Large planets often orbit close to their star, small planets are much more common than larger ones, and as a new study shows, orbits aren't always circular.
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Gravitational slingshots are now a common part of space missions where the trajectory of a spacecraft is altered using the gravity of another body. These often bring fabulous opportunities for an extra bit of bonus science such as that demonstrated by ESA's Hera mission on its way to asteroid Dimorphos. It's following up on the DART 2022 impact but to get there, it's used the gravity of Mars. It came within 5,000 km of the red planet and on its way, was able to take a look at Mars' smaller moon Deimos from its far side.
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Supernova explosions are powerful enough to cause mass extinctions if they're close enough. But can we tie supernovae to any of Earth's five mass extinctions? New research shows supernovae could be responsible for the Late Devonian and Late Ordovician mass extinctions.
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When Betelgeuse goes off, it's going to be the show of a lifetime. But it's not going to hurt us.
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Despite their overall similarities, asteroids are usually pretty distinct from one another. Vesta has a very different spectroscopic profile than Psyche, for example. So it might come as no surprise that another of the main asteroids - Pallas - is in a class all its own except for the 300 or so members of its "family" with similar orbital profiles and spectroscopic lines. A new paper from researchers who were then Visiting Astronomers at NASA's Infrared Telescope Facility (IRTF) in Haiwi'i took a look at members of that family in the infrared for the first time and compared them to a particular Near-Earth object that might have a similar make-up.
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Earlier this week, the Space Telescope Science Institute (STScI) announced the science objectives for the fourth cycle of the James Webb Space Telescope's (JWST) General Observations program - aka. Cycle 4 GO. In keeping with Webb's major science objectives, many of these programs will focus on the study of the earliest galaxies in the Universe.
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Ingenuity proved beyond a shadow of a doubt that a helicopter can operate on another planet. Over 72 flights, the little quadcopter that could captivated the imagination of space exploration fans everywhere. But, several factors limited it, and researchers at NASA think they can do better. Two papers presented at the recent Lunar and Planetary Science Conference, held March 10-14 in The Woodlands, Texas, and led by Pascal Lee of NASA Ames and Derric Loya of the SETI Institute and Colorado Mesa University, describe a use case for that still-under-development helicopter, which they call Nighthawk.
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Exploration of the outer Solar System may be getting a boost from the Vera Rubin Observatory (VRO). When this gigantic telescope opens its eye later in 2025, it begins a decade-long survey of the ever-changing sky. As part of this time-lapse vision of the cosmos, distant objects in the Kuiper Belt will be among its most challenging targets.
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X-ray astronomy is a somewhat neglected corner of the more general field of astronomy. The biggest names in telescopes, like Hubble and James Webb, don't even touch that bandwidth. And Chandra, the most capable space-based X-ray observatory to date, is far less well-known. However, some of the most interesting phenomena in the universe can only be truly understood through X-rays, and it's a shame that the discipline doesn't garner more attention. Kimberly Weaver of NASA's Goddard Space Flight Center hopes to change that perception as she works on a NASA Institute for Advanced Concepts (NIAC) grant to develop an in-space X-ray interferometer that could allow us to see for the first time what causes the power behind supermassive black holes.
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Thursday brought with it a total lunar eclipse for parts of the world that could see the Moon. If you missed it (like I did) then no problem since Firefly Aerospace's Blue Ghost mission has got your back. The lunar lander took a break from its science duties on our nearest astronomical neighbour to capture this stunning image of the eclipse. Observers on Earth saw the shadow of the Earth fall across the Moon but for Blue Ghost, it experienced a solar eclipse where the Sun hid behind the Earth!
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Solar Power Satellite (SPS) advocates have been dreaming of using space resources to build massive constructions for decades. In-space Resource Utilization (ISRU) advocates would love to oblige them, but so far, there hasn't yet been enough development on either front to create a testable system. A research team from a company called MetaSat and the University of Glasgow hope to change that with a new plan called META-LUNA, which utilizes lunar resources to build (and recycle) a fleet of their specially designed SPS.
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The Space Telescope Science Institute (STScI) has announced the science objectives for Webb's General Observer Programs in Cycle 4 (Cycle 4 GO) program. The Cycle 4 observations include 274 programs that establish the science program for JWST's fourth year of operations, amounting to 8,500 hours of prime observing time. This is a significant increase from Cycle 3 observations and the 5,500 hours of prime time and 1,000 hours of parallel time it entailed.
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A distant trio of worlds may shed light on planetary formation in the early solar system.
Sometimes, good things come in threes. If astronomers are correct, a system in the distant Kuiper Belt may not be two but three worlds, offering an insight into formation in the early solar system.
The study comes out of researchers at Brigham Young University and the Space Telescope Science Institute.
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