The known universe is full of shockingly huge things. Here are the largest planets, stars, galaxies, and structures we've observed in the universe so far.

We’ve grown up with the idea that the universe will expand forever, meaning the "cosmological constant" is positive. What if ...

"For the last 20 years, people believed that the cosmological constant is positive, and the universe will expand forever," Tye says. "The new data seem to indicate that the cosmological constant is ...

According to the equations that govern black holes, the larger one of these cosmic behemoths is the lower its average density ...

Not all stars are created equally. Astronomers believe that the first stars to form after the Big Bang were mostly made of ...

The oldest and most distant black hole known to scientists dates back 13.3 billion years ago, when our universe was still in its teething stage, according to findings published this month. The ...

"We're really pushing the boundaries of what current technology can detect." A team of astronomers says it has identified the most distant black hole ever confirmed — a cosmic heavyweight that formed ...

The early universe was already warm before reionization, revealing that the first stars did not flicker on in an icy cosmos.

If ultimately true, the universe will reach its maximum size around 11 billion years from now. At that point, physics (and ...