One Day We Might Seed the Universe With Life. But Should We?

By Brian Koberlein - March 26, 2025 03:06 PM UTC | Astrobiology
Suppose humanity was faced with an extinction-level event. Not just high odds, but certain-sure. A nearby supernova will explode and irradiate all life, a black hole will engulf the Earth, a Mars-sized interstellar asteroid with our name on it. A cataclysm that will end all life on Earth. We could accept our fate and face our ultimate extinction together. We could gather the archives from libraries across the world and launch them into space in the hopes that another civilization will find them. Or we could build a fleet of arks containing life from Earth. Not people, but bacteria, fungi and other simple organisms. Seed the Universe with our genetic heritage. Of all of these, the last option has the greatest chance of continuing our story. It's an idea known as directed panspermia, and we will soon have the ability to undertake it. But should we?
Continue reading

Could Venus Host Life? The Venus Life Equation Can Help Us Find Out

By Evan Gough - March 26, 2025 01:09 PM UTC | Planetary Science
What drives us to send probes throughout the Solar System and rovers and landers to Mars? It's not cheap, and it's not easy. It's because we live inside a big, natural puzzle, and we want to understand it. That's one reason. But the main reason for space exploration is to search for life beyond Earth. That our planet could be the only planet to host life is a disquieting thought.
Continue reading

Researchers are Continuing to Scale Up Lightsails That Could Explore the Cosmos

By Mark Thompson - March 26, 2025 11:39 AM UTC | Stars
It's been almost 10 years since Breakthrough Starshot began funding research into interstellar missions. Back then, state of the art meant a tiny lightsail just 0.25mm across, skip forward to today and, following their funded research, a new prototype has been revealed measuring 60mm x 60mm and just 200 nanometres thick! We are not quite able to use it to hop to Proxima Centauri but the technology keeps advancing until that day arrives.
Continue reading

Catch a Deep Partial Solar Eclipse Spanning the North Atlantic This Weekend

By David Dickinson - March 26, 2025 06:50 AM UTC | Observing
Got clear skies this weekend? If clouds cooperate, observers in the North Atlantic and surrounding regions may witness a rare spectacle: a partial solar eclipse. This is the second eclipse of 2025, and bookends the first eclipse season of the year. The season started with March 14th total lunar eclipse. Depending where you are observing from, this is a shallow to a deep partial, 'almost' total solar eclipse.
Continue reading

There are a Billion Craters Waiting to Be Explored Near the Moon's South Pole

By Mark Thompson - March 26, 2025 05:55 AM UTC | Planetary Science
The focus is all on the Moon at the moment as we strive to establish a permanent lunar base. At the south polar region there are permanently shadowed craters protecting pockets of water ice. Korea's Pathfinder Lunar Orbiter (KPLO) has been capturing images of these craters using its ShadowCam instrument. Now, using that data, planetary scientists are using a machine learning algorithm to identify over a billion impact craters in the region, deep inside the shadowed craters and each is at least 16 metres in diameter.
Continue reading

The Europa Clipper Can Find the Best Landing Sites on the Ocean Moon

By Evan Gough - March 25, 2025 01:51 PM UTC | Planetary Science
There's a well-established paradigm in planetary body exploration. It begins with a flyby, then later an orbiter, and then, if possible, a lander. Previous spacecraft have performed single flybys of Europa, and the Europa Clipper orbiter is on its way to Jupiter's moon Europa for a more detailed orbital study of the frozen moon. Hopefully, a lander will follow. A presentation at the recent Lunar and Planetary Science Conference showed how the Europa Clipper can help find the best landing sites on the icy ocean moon for a future Europa lander.
Continue reading

A New Theory Explains the Surprising Origin of the Planet Mercury

By Mark Thompson - March 25, 2025 10:36 AM UTC | Planetary Science
Compared to the other terrestrial planets, Mercury has always been a bit of a mysterious one. It's internal structure is very different from its planetary siblings with its core accounting for 70% of its overall mass and an unusually thin mantle composed of silicates. One theory suggests a head-on collision between a larger proto-Mercury and a smaller object while another suggests Mercury sideswiped an Earth-mass object. It may be something completely different and a new paper suggests that a grazing collision between two similarly sized bodies led to the formation of the planet we see today.
Continue reading

The Moon Might Have Formed Earlier Than We Thought

By Mark Thompson - March 25, 2025 09:51 AM UTC | Planetary Science
The Moon is a common sight in our night time (and sometimes daytime) skies but it hasn't always been there. The widely accepted theory of lunar formation involves a Mars-sized planet crashing into the Earth, creating a cloud of debris that eventually that eventually coalesced to form the Moon. Estimates of this cataclysmic event that gave us the Moon range from between 4.52 to 4.35 billion years ago however a new presentation at the Lunar and Planetary Science Conference have pushed that timeline back even further!
Continue reading

How an Actively Feeding Supermassive Black Hole Could Be Good for Life

By Carolyn Collins Petersen - March 24, 2025 08:11 PM UTC | Black Holes
When it comes to safe places for life, supermassive black holes are probably the last place you'd consider safe for nearby planets, let alone life-bearing ones. There are good reasons for this: those monsters at the hearts of galaxies suck down everything that comes into contact with them. When they do that, they blast out killer radiation. Neither activity is necessarily good for life. Or is it? As it turns out, radiation from these active galactic nuclei (AGN) can nurture life under the right circumstances.
Continue reading

A Seemingly Normal Spiral Galaxy Has Huge Jets Extending Millions of Light-Years

By Mark Thompson - March 24, 2025 04:41 PM UTC | Astrobiology
Scientists have detected a fascinating spiral galaxy located about one billion light-years away. At the heart of this cosmic goliath, powerful radio jets are blasting out of its centre, stretching six million light years into space. A team of researchers have suggested that a smaller dwarf galaxy plunged into its centre, passing close to its supermassive black hole triggering immense flares, intense radiation and driving the colossal radio jets. Surprisingly however, despite the tremendous amounts of energy, the galaxy has kept its spiral structure.
Continue reading

Lunar Samples Identify Exactly When the Moon's Largest Crater Formed

By Mark Thompson - March 24, 2025 03:40 PM UTC | Planetary Science
China's Chang'e-6 mission has been exploring the largest crater on the Moon. It's known as Aitken Basin and is found at the South Pole of the Moon where craters are permanently shadowed. The crater is a whopping 2,500 km across and measures 10km deep and Chang'e-6 data has revealed that a giant asteroid smashed into the Moon about 4.25 billion years ago.
Continue reading

Researchers Test a Completely Flat Telescope Lens

By Matthew Williams - March 24, 2025 10:53 AM UTC | Astrobiology
Telescope optics can be made of mirrors or lenses, but in both cases, they're bulky and need to follow a strict mathematical curve to focus light. Researchers have shown that it's possible to make a completely flat lens that focuses light. Traditionally, this has been done with Fresnel lenses, but they distort colors. Their new technique carves tiny concentric rings into a substrate that matches the wavelengths of different colors, allowing a full-color, in-focus image.
Continue reading

The Most Distant Known Galaxy Already Had Oxygen

By Brian Koberlein - March 24, 2025 08:16 AM UTC | Extragalactic
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.
Continue reading

Why Can't Physicists Decide if Warp Drives are Real?

By Paul Sutter - March 23, 2025 05:25 PM UTC | Physics
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

The Star Grinder: A Cloud of Black Holes at the Center of the Milky Way

By Brian Koberlein - March 23, 2025 10:58 AM UTC | Black Holes
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