As far as cosmologists can tell, the mysterious force behind the accelerated expansion of the universe, a force that we call dark energy, remains constant. But it may not have done so in the past.
SPACE.com invites experts in space exploration, science & technology to provide insightful commentary and informed perspective on news, current events, innovations, big ideas and ongoing research. Expert Voices includes Op-Ed analysis and opinion as well as interesting observations from the field and space exploration efforts around the world.
All four outer planets in our solar system sport at least a few rings, but so far, we haven't observed any such features around exoplanets. That's confusing.
String theory is a purported theory of everything that physicists hope will one day explain … everything.
Life for the 19th-century astronomer was kind of monotonous, 200 years after Galileo's revolutionary work with the telescope.
Sometimes the forming star swallows up a huge amount of matter, resulting in a burst of activities in the massive star.
It was a big moment for our cosmos when the first stars awoke, but it's an elusive one for scientists.
As with any major human exploration, there will be a number of obstacles to overcome when we send people to Mars.
The world of the teensy-tiny, the quantum realm, could have a favorite flavor. Here's why that's a big deal.
Alien life is out there, but our current theories seem to be steering us away from it, says this scientist.
String theory is a powerful idea, unfinished and untested, but one that has persisted for decades despite inauspicious beginnings.
What if I told you that our universe was flooded with hundreds of kinds of nearly invisible particles and that, long ago, these particles formed a network of universe-spanning strings?
Researchers recently released simulations of the Large Magellanic Cloud — a satellite galaxy of the Milky Way — and found that cosmic rays from a starburst event are starting to rip it apart.
For the last decade or more, Muggles around the world have been busy designing and perfecting a similar device called a coronagraph.