Stars and Galaxies

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.

Two astronauts gear up for a historic SpaceX launch, Ben and Jerry's launches a moon-inspired ice cream flavor, and astronomers spot a "ring of fire" galaxy. Here are the top images from Space.com.

Eleven billion years ago, a hot, active, eyeball of a galaxy glared across space. It formed in a violent collision, and could help explain the Milky Way's spiral.

A massive, rotating disk galaxy that first formed just 1.5 billion years after the Big Bang, could upend our understanding of galaxy formation, scientists suggest in a new study.

NASA has renamed its Wide Field Infrared Survey Telescope (WFIRST) to honor the renowned astronomer Nancy Grace Roman, also known as the "mother of Hubble."

Researchers figured out why this galaxy looks like an enormous X in invisible radio light.

China's FAST radio telescope has uncovered the first known pulsar in the star cluster Messier 92. The super-fast pulsating object forms one part of an eclipsing binary.

It was a major scientific scandal as established astronomers and a female graduate student butted heads over the composition of the sun.

In his new book, "What Stars Are Made Of: The Life of Cecilia Payne-Gaposchkin," author Donovan Moore tells the story of a young British scientist at the forefront of astrophysics.

Scientists have spotted evidence of Jupiter-like stripes in the thick atmosphere of a nearby brown dwarf, a new study reports — and this evidence was gathered in a novel way.

Astrophysicist Katie Mack will talk about the end of the universe today (May 6), and you can follow the discussion live — and even ask her a question, if you'd like.

Is space-time ultimately smooth at the tiniest of scales, or something else? It seems impossible to measure, but researchers are beginning to look down. Deep down.

It's been 30 years since NASA launched the Hubble Space Telescope on April 24, 1990.

This black hole's parents never told it not to play with its food.

In the beginning, it was just the Large Space Telescope, its mundane name a marker of how very extraordinary an observatory it was.

Einstein's theory of general relativity just passed a dramatic black-hole test with flying colors.

A mammoth star explosion known as SN2016aps, which occurred in a galaxy about 3.6 billion light-years from Earth, is the brightest supernova ever seen, a new study reports.

For the first time ever, astronomers have measured wind speed on a brown dwarf, an object heftier than a planet but not massive enough to host the fusion reactions that power stars.

The new results challenge a core tenet of modern cosmology.