Each of the planets, labeled b, c, d, and e, has a mass between 20% and 30% of Earth's, making them among the smallest yet detected using the radial velocity method.

Whether a galactic environment has the right conditions for habitable planets to form could depend on how the black hole in ...

GS-z13-1, marks the earliest sign yet spotted of the era of cosmic reionization at 330 million years after the Big Bang.

Scientists are using an array of instruments to detect other planets, some of which may harbor life—and others that most ...

Decades of constant X-ray emission from the Helix Nebula’s white dwarf suggest debris from a Jupiter-sized planet steadily rains upon the star.

An asteroid discovered over 200 years ago which is roughly the size of Germany would have catastrophic consequences for life ...

The faraway exoplanet could help provide answers as to why there are hardly any planets with twice the diameter of Earth.

We've known for over 30 years that there are other stellar systems in our galaxy, but we don't have any idea how many there ...

So in some sense, alien worlds were not first discovered in the 1990s or even the 1980s. It took nearly a century to fully ...

Only a few years ago, astronomers heralded the discovery of a rocky world circling the sun 's closest space neighbor, Proxima ...

A partial solar eclipse on Saturday will make it look as if the moon has taken a bite out of the sun over parts of North ...

What drives us to send probes throughout the Solar System and rovers and landers to Mars? It's not cheap, and it's not easy.