One new study shows how dark energy may be changing over time.
This year marks the 90th anniversary of Edwin Hubble's discovery that the universe is expanding, and scientists are still trying to work out the details.
The early universe was a very different place than it is now. But it may have been the perfect environment for a strange class of giant, puffy stars that used dark matter as fuel.
The idea of multiple universes, or a multiverse, is suggested by not just one, but numerous physics theories. Here are the top five ways additional universes could come about.
A timeline of important events in our universe's history.
What is the scientific basis for the popular science-fiction convention of multiple universes?
By focusing X-rays, the NuSTAR space telescope will study black holes and other exotic objects in the universe. Learn all about NASA's NuSTAR X-ray space observatory in this SPACE.com infographic.
An exciting new theory says that the universe doesn't need dark matter or dark energy. Find out why experts believe this .. READ MORE
So much about galaxies remains a mystery. We know what they're made of and that we live in one (the Milky Way), but how many galaxies are in the universe?
A timeline of important events in our universe's history.
It's the leading idea for what set up and gave rise to the Big Bang. So why doesn't one of its co-founders accept it?
While the Spitzer Space Telescope is headed for retirement, many of its breakthroughs will be studied more precisely with NASA's forthcoming James Webb Space Telescope.
If spacetime is like a fabric, and mass bends it, what flattens it back out again?
The universe has a huge hole that dwarfs anything else of its kind. The discovery caught astronomers by surprise.
A timeline of important events in our universe's history.
While the universe is constantly revealing more secrets, some of its building blocks are beautifully understood.
Super Heavy getting ready
Just like migratory birds and sea turtles, humans might also be able to sense the magnetic field that hugs our planet.
Super Heavy getting ready
A timeline of important events in our universe's history.
A timeline of important events in our universe's history.
The Universe is expanding, but different techniques can't agree on how fast. No matter what, something major has got to give.
Hubble Space Telescope astronomers have discovered that the universe is expanding 5-9% percent faster than expected. They made the discovery by refining the universe's current expansion rate to unprecedented accuracy, reducing the uncertainty to only 2.4%. The team made the refinements by developing innovative techniques that improved the precision of distance measurements to faraway galaxies. These measurements are fundamental to making more precise calculations of how fast the universe expands with time, a value called the Hubble constant.
Every summer I try to get up to Mt. Piños at least once. Although it's 130 miles from home and 30 miles further from home than my observ...
There were two periods of exponential expansion in the Universe: one today, dark energy, and one long ago, inflation. Are they related?
An upcoming generation of radio telescopes will soon let us look back into the dark age of the universe, potentially shedding light on some of the greatest cosmic mysteries of our time.
While the universe is constantly revealing more secrets, some of its building blocks are beautifully understood.
The world's largest single-dish telescope, based in China, has joined the hunt for intelligent alien life in the universe.
Super Heavy getting ready
