Particles called axions may be the reason the 'Magnificent 7' cluster of neutron stars emits extreme X-rays.
Data from the now-destroyed Arecibo radio telescope has revealed a bizarre new type of hybrid venomous-spider star.
NASA fired up the core stage of its massive new megarocket Saturday (Jan. 16) in a critical test that appeared to shut down early.
NASA is going to light up the most powerful rocket it's ever built Saturday (Jan. 16), though it won't go anywhere.
The collapse of the iconic radio telescope at the Arecibo Observatory in Puerto Rico last month has left astronomers with a host of questions about what went wrong and what comes next.
A rapidly twirling, ultramagnetic 500-year-old infant has been spotted zipping at never-before-seen speeds through the Milky Way. It belongs to a super-rare flavor of super-rare star.
There have been no signs of supersymmetry, and the theory is looking a little shaky, researchers say.
NASA plans to ignite an absolutely mammoth rocket on Jan. 17, the largest it's built since the Apollo program
Mercury, Jupiter and Saturn will form a tight triangle in the sky this Sunday during a rare 'triple conjunction' event.
Harvard astrophysicist Avi Loeb has reignited a debate about whether alien life can explain an object that visited the solar system in 2017 in a scathing new book.
New research proposes that the first black holes came from clumps of gravitinos, exotic, hypothetical particles that managed to survive the first chaotic years of the Big Bang.
Similar to the bonds found in water, but way more powerful, this new bond could offer deep insight into the true workings of chemical reactions.
Space.com caught up with NASA Planetary Defense Officer Lindley Johnson to discuss recent events and what's on the planetary-defense agenda in the coming year.
What if there is more than one cosmological agent for dark energy? This mixture would have strange effects in our universe, making it potentially detectable with upcoming surveys.
Mars' Valles Marineris is nearly 10 times as long as the Grand Canyon and three times as deep, but nobody knows how it formed.
The Quadrantid meteor shower is peaking, and skywatchers in North America have a good chance of seeing the tail end of the show tonight.