Magazine | Page 10 of 281 | Astronomy.com

V838 Monocerotis

What is a light echo?

10 modern mysteries of the universe

Star trails over Joshua Tree National Park

August 2024: What’s in the sky this month?

Orion Nebula

Observing, Observing Basics

How do light pollution filters work?

Deep-Sky Objects

Tools for finding dark skies

The gegenschein rests at the tip of the dimmer pyramidal-shaped false zodiacal light.

The mysteries behind the gegenschein

LHC at CERN

Is there a hottest temperature possible in the universe?

Neutron stars are incredibly dense objects about 10 miles (16 km) across. Only their immense gravity keeps the matter inside from exploding; if you brought a spoonful of neutron star to Earth, the lack of gravity would cause it to expand rapidly.

Exotic Objects, Science

What would happen if a tablespoonful of a neutron star was brought to Earth?

galaxy cluster Abell 2744 as seen by JWST and the Chandra X-ray Observatory

Cosmology, Exotic Objects

Astronomers say they’ve spotted the oldest, most distant black hole. How do they know this?

E: Time’s Telescope was an almanac published in London from 1814 to 1834.

The history of astronomical almanacs

Hubble image of variable star RS Puppis

How do Cepheid variables indicate distance?

20 things to see on the Moon: An observer’s guide to lunar names