By Carolyn Collins Petersen
March 23, 2025
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.
Continue reading
By Paul Sutter
March 23, 2025
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?
Continue reading
By Brian Koberlein
March 23, 2025
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.
Continue reading
By Matthew Williams
March 23, 2025
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!
Continue reading
By Paul Sutter
March 22, 2025
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?
Continue reading
By Brian Koberlein
March 22, 2025
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.
Continue reading
By Paul Sutter
March 21, 2025
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.
Continue reading
By Mark Thompson
March 21, 2025
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.
Continue reading
By Mark Thompson
March 21, 2025
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.
Continue reading
By Alan Boyle
March 20, 2025
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.
Continue reading