A close look at the "stellar stream" known as Theia 456 finds it contains contains 468 stars born at the same time.

Our Earth and sun were born together, and their fates are tied together. As our star becomes a red giant and billows outward, our planet will become a dry, scorched, uninhabitable rock. This will happen even as our Milky Way galaxy collides with the Andromeda galaxy next door.

A new study has found that pollution from microplastics is widespread in the Arctic Ocean, and 92% of those particles are minuscule synthetic fibers from our clothes.

2020 was Earth's hottest year in the 140-year record, effectively tying 2016, the previous record-holder.

NASA's Solar Dynamics Observatory has been continuously observing the sun since its launch in 2010. From its vantage point above Earth, it sees the moon pass in front of the sun 2 to 5 times a year.

These next several days - January 14, 15 and 16, 2021 - you can spot the waxing crescent moon and innermost planet Mercury, near the sunset point.

We're at home. How about you? But we just discovered these virtual tours, galleries and live webcams from around the world, which we wanted to share. Stay home, and have some virtual fun ...

Megalodons - the extinct giant sharks that lived in most of Earth's oceans about 3 million years ago - gave birth to babies that were larger than adult humans, scientists say.

The planetary trio has come and gone, but some in EarthSky's community captured photos!

Astronomers have a new measurement for the distance of quasar J0313-1806, making it the new record-holder for the most distant quasar known. We're seeing it just 670 million years after the Big Bang, or more than 13 billion light-years away.