An unstable massive star has suddenly vanished from view, and astronomers aren't sure if it collapsed into a black hole or is playing peek-a-boo behind galactic dust.
Astrophysicists have spotted the strangest gravitational-wave signal yet, an observation that could force scientists to rewrite what they know about the cosmos.
Join real-life astrophysicist in an "ask me anything" with Joe Pesce of the National Science Foundation in our Space.com Forums this week!
Far-off alien planets covered in vast oceans might be common in our Milky Way galaxy, scientists find.
Incredible new images from the Hubble Space Telescope reveal nearly dead stars spewing blasts of hot gas into deep space in strange but stunning ways.
In a new study, astronomers report the first detection of X-rays from a sun-like star in the earliest phase of its evolution.
Mysterious pulses of radio waves from deep space can fire in regular patterns, a discovery that might help shed light on the cause of these puzzling outbursts, a new study finds.
Astronomers have revealed the atmosphere of the red supergiant star Antares in stunning, unprecedented detail.
NASA's pioneering New Horizons spacecraft has traveled so far that its view of the cosmos is noticeably different than ours.
Researchers have created a miniature version of supernova shock waves in a lab here on Earth to solve a long-standing cosmic mystery.
The first stars in the universe formed even earlier than astronomers had thought, a new study suggests.
Astronomers have discovered an activity cycle in another fast radio burst, potentially unearthing a significant clue about these mysterious deep-space phenomena.
NASA's Hubble Space Telescope is further probing the remnants of a massive space explosion visible from Earth 3.5 million years ago.
Astronomers time traveled through archives of data to spot an object that made history in the 1980s and solve a long-standing cosmic mystery.
You can't rush a superdense star as it gobbles up bites of a neighbor for nearly two weeks before shooting off a burst of X-rays thousands of times brighter than our sun.
Twin shock waves produced by the galaxy's central black hole could have inflated the gargantuan Fermi Bubbles about 6 million years ago, a new study suggests.
Two entirely different ways of "weighing" the cosmos are producing disparate results. The discrepancy could be a sign that physicists will need to revise the standard model of cosmology.