Magazine

Stars

What is the baseline for determining the magnitude scale of celestial objects? Why do brighter objects have negative numbers?

Deep-Sky Objects

A tale of two marathons

Astrophotography

What to do about satellite trails

Human Spaceflight, Robotic Spaceflight

See more SOFIA

Exoplanets, Planets

Mars returns to glory

Deep-Sky Objects

The raspberry “beret”

Stars

What factors determine if a massive star (say, 100 solar masses) forms instead of a Sun-like star?

Cosmology

When matter and antimatter annihilate each other

Deep-Sky Objects

Cosmic phantoms

Observing

10 top winter binocular treats

Science

Editor David J. Eicher’s top 20 Queen songs: 10-1

Science

How do astronomers determine what causes starlight to shift toward the red end of the electromagnetic spectrum?