This glossary provides definitions for common terms related to outer space, astronomy, and cosmology.
Whenever someone talks about black holes, they almost always talk about the event horizon and the singularity. After all, that's what defines a black hole, right? Well, it depends on what you mean by black hole. There are some that would argue a black hole doesn't need a singularity, and that could mean they don't even have an event horizon.
So where do we go after years of empty searches for dark matter? We haven’t learned nothing. After decades of searches, we’re narrowing down the range of what dark matter can and cannot be.
A SpaceX Falcon 9 rocket soars away from Vandenberg Space Force Base in California at the beginning of the Starlink 11-23 mission on Oct. 31, 2025. Image: SpaceX
Update Oct. 31, 6:30 p.m. EDT (2230 UTC): SpaceX deployed the 28 Starlink satellites.
A waxing gibbous moon and the ringed planet Saturn will enlighten our sky for treat-or-treaters this Halloween.
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What began with tragedy ended in triumph. This is the untold story of the European Space Agency’s pioneering 25-year Cluster mission to study how invisible solar storms impact Earth's environment.
Image: To celebrate Halloween, we bring you these spooky sights of Lake Carnegie in Australia, captured from space by Copernicus Sentinel-2.
Image: Flickering flame: spooky spirits or serious science?
Saturn is in excellent view all evening. In a telescope its rings look like a thin needle piercing the big yellow globe. Soon the rings will turn exactly edge-on.
How could the principle of “radical mundanity” proposed by the Fermi paradox help explain why humans haven’t found evidence of extraterrestrial technological civilizations (ETCs)? This is what a recently submitted study hopes to address as a lone researcher investigated the prospect for finding ETCs based on this principle. This study has the potential to help scientists and the public better understand why we haven’t identified intelligent life beyond Earth and how we might narrow the search for it.
Blue Origin conducted a roughly 40-second-long static fire of its New Glenn rocket on Oct. 30, 2025. This hotfire of the seven BE-4 engines is a precursor to the launch of NASA’s EscaPADE mission. Image: Adam Bernstein / Spaceflight Now
Blue Origin lit up a pocket of Florida’s Space Coast Thursday night when it hot fired its New Glenn rocket for an engine test lasting roughly 40 seconds in duration.
The Vera Rubin Observatory (VRO) hasn't yet begun it's much-anticipated Legacy Survey of Space and Time. But it saw its first light in June 2025, when it captured its Virgo First Look images as part of commisioning its main camera. Those images are a sample of how the observatory will perform the LSST and feature the Virgo Cluster of galaxies.
The Kepler Belt, also known as the Edgeworth-Kepler Belt, is a circum-stellar disc in the outer Solar System, extending from the orbit of Neptune at 30 AU (astronomical units) to approximately 50 AU from the Sun. It is similar to the asteroid belt, but it is far larger—20 times as wide and 20 to 200 times as massive. Like the asteroid belt, it consists mainly of small bodies, or remnants from the Solar System's formation.
Nature's like a photographer's canvas backdrop, lit up by the different types of electromagnetic radiation. Gamma radiation is the most powerful, strong enough to rip your double helix in two. Radio waves are at the low end. They're generally safe, and are almost omnipresent; we live in a sea of radio waves.
A new study has found that the 260-day ritual calendar is the key to understanding how the Maya predicted solar eclipses.
What if I told you that while you can’t see dark matter, maybe you can hear it? I know, I know, it sounds crazy…and it is crazy. But it’s crazy enough that it just might work. It’s a real life experiment, called the…let me see here…the Cryogenic Rare Event Search with Superconducting Thermometers, or CRESST – that’s a double s in case you didn’t catch that. Look it’s not the greatest of acronyms but we’re going to just go with it.
A new James Webb Space Telescope image showcases the gorgeous Red Spider Nebula against a backdrop of twinkling stars.
Mike French (left) hosted a fireside chat with former NASA administrators Jim Bridenstine (center) and Charles Bolden (right) at the 2025 von Braun Space Exploration Symposium in Huntsville, Alabama. Image: American Astronautical Society via livestream
Two former NASA Administrators called on the space agency to rethink its plans to land astronauts on the Moon using SpaceX’s Starship, saying development of the revolutionary vehicle was taking too long and required unnecessary complexity.
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Follow the online briefing on the launch scheduled for 4 November 2025. The Copernicus Sentinel-1 mission delivers radar images of Earth’s surface. It is vital for disaster response teams, environmental agencies, maritime authorities, climate scientists.
We successfully plugged the hole in the ozone layer that was discovered in the 1980s by banning ozone depleting substances such as chlorofluorocarbons (CFCs). But, it seems we might be unintentionally creating another potential atmospheric calamity by using the upper atmosphere to destroy huge constellations of satellites after a very short (i.e. 5 year) lifetime. According to a new paper by Leonard Schulz of the Technical University of Braunschweig and his co-authors, material from satellites that burn up in the atmosphere, especially transition metals, could have unforeseen consequences on atmospheric chemistry - and we’re now the biggest contributor of some of those elements.
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