Interstellar comet 3I/ATLAS was first detected on July 1st 2025 as it approached the Sun. Multiple telescopes, including the Very Large Telescope, the Hubble Space Telescope, and the James Webb Space Telescope have taken turns observing the comet as it continued on its hyperbolic trajectory out of the Solar System. It reached solar conjunction on October 21st, and on October 29th it came closest to the Sun.
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Surprise! Saturn's huge moon Titan may not have a buried ocean after all
"We're not certain if having widespread liquid pockets instead of a global ocean makes Titan more or less habitable."
ESA's XMM-Newton Examines Comet 3I/ATLAS Prior to Closest Earth Passage Friday
*ESA’s premier X-ray observatory images interstellar comet 3I ATLAS. *
Watch interstellar comet 3I/ATLAS make its closest approach to Earth in free livestream on Dec. 18
The livestream will begin at 11 p.m. EST Dec. 18 (0400 GMT on Dec. 19), weather permitting.
Best Fallout gifts to spend your caps on
We've rounded up the best Fallout gifts across the wasteland ahead of season two of the hit TV show, available to stream this month.
Crewed Russian spacecraft meets up with ISS | Space photo of the day for Dec. 17, 2025
The Soyuz launched on Nov. 27, 2025 from the Baikonur Cosmodrome in Kazakhstan.
Proba-3 fills the solar observation gap
It has been a busy year for the European Space Agency’s Proba-3 mission. The satellite duo has already created more than 50 artificial solar eclipses in orbit since the mission operations began less than a year ago. The resulting data confirm Proba-3's ability to provide the missing puzzle piece in our observations of the Sun's enigmatic atmosphere – the corona.
Experiments on a private space station: Vast asks scientists for research proposals
The California startup Vast has opened a call for scientific research aboard its Haven-1 private space station, which is set to launch atop a SpaceX rocket next year.
Latest Comet 3I/ATLAS news: Closest approach to Earth this week
Wednesday, Dec. 17, 2025: Your daily feed for the holiday flyby of interstellar comet 3I/ATLAS by Earth.
Why Most Exoplanets Are Magma Worlds
In astronomy, there is a concept called “degeneracy”. It has nothing to do with delinquent people, but instead is used to describe data that could be interpreted multiple ways. In some cases, that interpretation is translated into exciting new possibilities. But many times, when that happens, other, more mundane explanations are ignored for the publicity that the more interesting possibilities provide. That seems to have been the case for many “sub-Neptune” exoplanets discovered recently. Some theories have described them as Hycean worlds - worlds that are filled with water oceans or ice. But a new paper from Robb Calder of the University of Cambridge and his co-authors, available in pre-print on arXiv, shows that, most likely, these planets are almost all made of molten lava instead.
Interstellar comet 3I/ATLAS wasn't supposed to be there — meet the astronomer who discovered it
Dr. Larry Denneau of the University of Hawaii is nothing like your typical astronomer.
Galileo’s first Ariane 6 launch strengthens European resilience
On 17 December, two Galileo satellites lifted off from Europe’s Spaceport in French Guiana aboard an Ariane 6 rocket. This marked the 14th launch for Europe’s Galileo constellation, reinforcing Europe’s satellite navigation capabilities, resilience and autonomy.
Galileo L14 liftoff on Ariane 6
Video: 00:01:06
On 17 December, two new Galileo satellites lifted off from Europe’s Spaceport in French Guiana aboard an Ariane 6 rocket. This marked the 14th launch for Europe’s satellite navigation operational satellite programme, reinforcing Europe’s resilience and autonomy.
Live coverage: SpaceX to fly Starlink mission using Falcon 9 booster flying for a 30th time
File: A SpaceX Falcon 9 rocket stands ready to launch the Starlink 7-14 mission from Vandenberg Space Force Base. Image: SpaceX
SpaceX is preparing for the launch of its Falcon 9 rocket Wednesday morning from Vandenberg Space Force Base in California. It’s set to be the second out of two planned flights that day, following a launch from NASA’s Kennedy Space Center in Florida scheduled for just hours before.
Live coverage: SpaceX preps sunrise Starlink launch from Kennedy Space Center
File: A Falcon 9 booster stands ready for the Starlink 12-2 mission at launch complex 39A. Image: Spaceflight Now.
Update Dec. 16, 7:50 p.m. EST (0050 UTC): SpaceX pushed back the T-0 liftoff time.
Wildfire smoke lofted miles high could have an unexpected effect on Earth's climate
New measurements demonstrate that smoke particles in the upper atmosphere are twice the size of lower-altitude ones.
NASA's Parker Solar Probe captures solar wind doing a 'U-turn'
NASA's Parker Solar Probe captured solar material looping back to the sun, revealing how it recycles magnetic energy and shapes future solar storms.
Steven Spielberg finally reveals 1st trailer for new UFO film 'Disclosure Day', and now we're terrified
Emily Blunt and Josh O'Connor star in Universal Pictures' eerie alien invasion project coming next summer.
NASA's MAVEN spacecraft is still silent at Mars — and apparently is spinning, too
NASA still hasn't heard from its MAVEN Mars orbiter, and the spacecraft appears to be spinning in an odd way as well.
Scientists Map the Sun’s Magnetic “Surface”
Where does the Sun end and the solar wind begin? Scientists have mapped the dynamic magnetic edge that bounds our star.
Stay up late tonight to watch Europe's Ariane 6 rocket launch its 1st pair of Galileo navigation satellites
Europe's Ariane 6 rocket is poised to launch a pair of Galileo satellites just after midnight on Wednesday (Dec. 17), adding to the continent's geopositioning constellation.
