Let’s start out with something that we can say for certain: we live in an expanding universe. Every single day, the universe gets a little bit bigger than it was the day before. But right away, when we say something like “we live in an expanding universe” certain questions start to pop up, and they’re far and away the most common kinds of questions that I get asked. If the universe is expanding, then what is it expanding into? And what is it expanding from? Where’s the edge of the universe, and where is it’s center?
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NASA’s Artemis 2 moon rocket comes together | Space photo of the day for Nov. 21, 2025
The Orion crew module gets stacked onto the Space Launch System in preparation for the upcoming Artemis 2 mission in early 2026.
James Webb Space Telescope spots a gassy baby galaxy throwing a tantrum in the early universe
The astronomers estimate that this galaxy will deplete itself of gas in only a few hundred million years.
This Week's Sky at a Glance, November 21 – 30
Saturn's rings are now the closest to edge on that they'll get. The famous interstellar comet has become higher and easier for amateur telescopes before dawn.
Earth from Space: The Danakil Depression
Image: The Copernicus Sentinel-2 mission takes us over one of Earth’s most extreme environments: the Danakil Depression in Ethiopia.
Finding star clusters in the Lost Galaxy
Image: Finding star clusters in the Lost Galaxy
Marking one year until BepiColombo reaches Mercury
The ESA/JAXA BepiColombo mission has been cruising towards Mercury since October 2018. With just one year to go until it arrives at its destination, what has the mission achieved so far? And what can we expect from its two spacecraft after they enter orbit around the Solar System’s smallest and least-explored rocky planet?
SpaceX launches the 100th mission of the year from Florida's Space Coast (video)
SpaceX launched 29 of its Starlink internet satellites tonight (Nov. 20), on the 100th mission of the year to take off from Florida's Space Coast.
Should I wait for Black Friday to get a streaming subscription?
With Black Friday 2025 fast approaching, is it worth waiting for the sales event in the hope of a streaming deal appearing, or should you subscribe now?
Tracking Mars' Ice Ages From Space
Human beings are pretty familiar with the concept of "ice ages." Not only is their ample physical evidence to suggest that glacial periods occurred during the Pleistocene epoch - which lasted from ca. 2.58 million to 11,700 years ago, there are even Indigenous oral traditions that speak of lake formation and dramatic climate shifts in the distant past. Far from being mere myths, these traditions are considered preserved accounts that are corroborated by scientific findings. However, the cycles of glacial and interglacial periods that characterize the Pleistocene were merely the latest in a long line of historical shifts in Earth's climate.
Rocket returned, lightly used: Why Blue Origin's landed New Glenn booster is so clean
Blue Origin's New Glenn rocket remained strikingly clean and white after two trips through Earth's atmosphere last week. Here's why the booster stayed largely char-free.
The Man in the Moon Gets a New Scar
I have to confess, despite spending years gazing at the night sky, telescope at the ready, tracking planets and hunting for deep sky objects, I only actually saw the Man in the Moon about five years ago. There I was, exploring lunar maria and highland regions, and I'd somehow never noticed what humans have been seeing for millennia.
Falcon 9 Starlink mission marks 100th launch of the year from Florida’s Space Coast
A Falcon 9 rocket rises from a fog bank on Nov.20, 2025, making the 100th launch of the year from Florida’s Space Coast. Image: John Pisani/Spaceflight Now.
A Falcon 9 rocket lifted off from the Kennedy Space Center Thursday evening on a milestone mission marking the 100th launch from the Space Coast this year.
Seeing an Interstellar Comet Through Martian Eyes
Interstellar objects are really rather rare. Since astronomers first spotted 'Oumuamua racing through our Solar System in 2017, we've detected only two more visitors from beyond; comet Borisov in 2019, and now 3I/ATLAS, discovered on 1 July 2025. These objects offer tantalising glimpses into other stellar systems, carrying material formed around distant stars. But they don't linger. They sweep through on hyperbolic trajectories, never to return, which makes every observation precious.
James Webb Space Telescope spots rapidly feeding supermassive black hole in the infant universe: 'This discovery is truly remarkable.'
"This challenges our understanding of black hole and galaxy formation in the early universe."
Some Exoplanets Can Create Their Own Water Through Crust-Atmosphere Reactions
Without water, life is highly unlikely, as far as scientists understand it. The entire idea of a habitable zone around other stars is based on a planet's potential to have liquid water on its surface. But where does this water come from?
Jeff Bezos' Blue Origin will build a 'super heavy' version of its powerful New Glenn rocket
Blue Origin plans to build an even more powerful version of its partially reusable New Glenn rocket, which aced its second-ever launch just last week.
Earth and Theia smashed to birth the moon, but did they first start out as close neighbors?
"The most convincing scenario is that most of the building blocks of Earth and Theia originated in the inner solar system. Earth and Theia are likely to have been neighbors."
Updates on Interstellar Comet 3I/ATLAS: NASA Images, Many Tails, and Non-gravitational Forces
Now that Comet 3I/ATLAS has emerged from the Sun's glare, its behavior is being monitored by every available observatory.
AI helps build the most detailed Milky Way simulation ever, mapping 100 billion stars
A record-breaking number of stars has been mapped by a new model that speeds up processing time while allowing smaller scale events, such as supernova explosions, to be incorporated into the simulation alongside larger-scale galactic processes.
