Astronomers studying extreme planetary systems have identified worlds so massive that they rival the smallest stars in size.

Huge, red "super-Jupiter" exoplanet orbits its star. Since astronomers first looked beyond the solar system three decades ago to discover extrasolar planets, or exoplanets, we've known that planets in ...

In this video, the channel—which sources its research from astrophysicists and the like—goes over the sizes of different black holes in the universe. As with other cosmological size comparisons, ...

There’s something about comparing the size of objects—say, moons or sci-fi starships—that is endlessly appealing. But while comparisons we’ve seen cover subsets of stuffs, none have looked at the big ...

Looking up into the night sky, it can be difficult to comprehend the vastness of the space that surrounds the Earth – and the impressive size of the various stellar and planetary bodies on display.

Astronomers have discovered a planet the size of Jupiter orbiting a star that’s only half the size of the sun — a celestial phenomenon that contradicts theories of planet formation. NGTS-1b, a massive ...