Astronomers measure a star’s brightness using the apparent magnitude system, where lower values indicate brighter stars.

A handful of planets in the solar system are expected to line up in the night sky for a few days in January 2025. Here's when ...

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

Hubble Space Telescope mapped Andromeda, revealing a chaotic history shaped by mergers. A 2.5-billion-pixel mosaic shows 200 ...

"We have by and large been ignoring triples in models and simulations — we're just starting to understand how these types of ...

The Blue Ghost lunar lander, built by the Texas-based company Firefly Aerospace for NASA, launched to space on Jan. 15, and ...

Measuring distances across the universe is much more challenging than measuring distances on Earth. Is a brighter star closer ...

"A parade of planets, also sometimes referred to as a planetary alignment, is when several planets in our solar system appear to line up in the sky from our perspective here on Earth," John Conafay, ...

But it is a rare class of star that NASA's Hubble Space Telescope ... appears in the night sky alongside the northern lights has now been ... New Data on Atmosphere from Earth to the Edge of ...

Mars will seem to disappear behind the full wolf moon Monday for many sky-gazers. Throughout January, also look up to see ...

It’s a term used by astronomers to describe when Earth, Mars and the Sun align. When this happens, Earth sits directly ...