A primer on dark energy, the mysterious force responsible for the universe's surprising accelerating expansion.
Big Bang theory is the leading explanation for how our universe began. According to the theory, the entire universe began as a tiny singularity that went through an explosive expansion 13.8 billion years ago, gradually expanding into the cosmos we see today. Today, astronomers can detect an "echo" from the Big Bang in the cosmic microwave background, a phenomenon that can be detected with radio telescopes. Big Bang Theory is also the name of a popular CBS sitcom about scientists, where several real-life scientists and astronauts have appeared.
Astrophysicist Neil deGrasse Tyson received the Stephen Hawking Medal for Science Communication Tuesday (June 6), becoming the first American scientist to earn the prestigious award.
Two telescopes teamed up to image one of the most massive known galaxy clusters. The results can help astronomers understand the universe and its origins.
On Jan. 26, 2017, astronomers announced that the universe is expanding faster than previously thought. See photos of the quasars seen by the Hubble Space Telescope that made the discovery possible.
Huge numbers of supermassive black holes are visible in a stunning new photo that astronomers said is the deepest X-ray image of the sky ever captured.
How much dark matter has gone missing since the Big Bang? New research suggests anywhere from 2 to 5 percent.
Dark matter, the mysteriously invisible substance that makes up about 27 percent of the universe, may not be as clumpy as scientists previously thought.
Researchers looked at a famous sliver of sky with new eyes to reveal galaxies' star-forming potential over time.
What did the universe look like as the very first stars and galaxies blazed into existence? An experiment designed to look back at that critical cosmic transition just got a huge funding boost.
It's not often that you can get promoted, commended and even awarded for failing to do your job. But that's just what happened to the discoverers of the key evidence supporting the Big Bang theory.
If you're a space traveler lost in the universe, a team of astronomers here on Earth has your back: They've made the largest ever 3D map of galaxies that humanity can see.
Experience the unfolding of time with Terrence Malick's "Voyage of Time: The IMAX Experience," set for release in IMAX theaters on Oct. 7.