Believe it or not, physicists are attempting to understand the universe when it was only a handful of seconds old.

The hypothetical Planet Nine may not be a planet but rather a small black hole that might be detectable from the theoretical radiation emitted from its edge, so-called Hawking radiation.

A team of physicists has proposed a clever plan to concoct a quantum theory of gravity: refine an age-old technique, and use it to probe the tiniest scales in the universe.

Black holes may not be black or holes, a new theory proposes.

New research suggests a way to move heat around "tidally locked" alien planets: ocean currents whipping around the worlds faster than they rotate.

Astrophysicists have a wild idea to explain the bizarre abundance of super-high-energy radiation shooting from the center of our galaxy: gravity portals.

A weird, super-powerful particle that's not truly a particle could have dominated the universe when it was just a second old, releasing a flood of ripples that permeated all of space-time.

It turns out we don't really understand habitable zones.

We don't know why the universe is dominated by matter over antimatter, but there could be entire stars, and maybe even galaxies, in the universe made of antimatter.

The universe may be filled with "mirror" particles — and these otherwise-undetectable particles could be shrinking the densest stars in the universe, turning them into black holes.

Astronomers have long wondered where high-energy cosmic rays come from within our galaxy. And now, new observations reveal an unlikely candidate: an otherwise mundane giant molecular cloud.

A mysterious "kick" in the early universe may have produced more matter than antimatter. And that imbalance may have also led to the creation of dark matter, researchers now say.

Where did the ingredients for life on Earth come from? A team of astronomers has found a crucial new link: the observation of essential "prebiotic" molecules around a still-forming star.

Surprisingly, the fate of a star is easy to predict. All you need to know is how big it is.

Bumblebee gravity could explain dark energy — if it's proven true.

According to a recent report, there have been no signs of supersymmetry, and the theory is looking a little shaky.

New research proposes that the first black holes came from clumps of gravitinos, exotic, hypothetical particles that managed to survive the first chaotic years of the Big Bang.

A team of physicists recently used a string-theory technique to reveal that we're on the cusp of detecting phase transitions in the early universe through their gravitational wave signature.

What if there is more than one cosmological agent for dark energy? This mixture would have strange effects in our universe, making it potentially detectable with upcoming surveys.

A massive jet launched from our galaxy's supermassive black hole may have destroyed any red giant stars that wandered into its path, a new study suggests.

It's easy enough to say what a star is: one of those bright pointy things that twinkle in the night sky. But the actual definition of a star is as rich and colorful as the stars themselves.

You wouldn't know it by looking at it, but the moon is a time capsule.

The truth is, astronomy remains as real, human and relevant as ever, though the reason why might surprise you.

The formation of the solar system is a challenging puzzle for modern astronomy and a terrific tale of extreme forces operating over immense timescales. Let's dig in.