Magazine | Page 166 of 278 | Astronomy.com

Astronomy’s favorite equations

More questions readers want answered

A pair of planetary conundrums

Even more questions for a cloudy night

Farewell, Brian

Do galaxies rotate clockwise or counterclockwise? Do all galaxies rotate in the same direction?

Photos of recent comet flybys show their nuclei to be barbell-shaped rather than spherical. What are the forces or processes that produce this shape?

Sketching Hercules’ two clusters

A tale of two clusters

Deep-Sky Objects, Observing

A stellar summer planetary nebula

Exotic Objects, Solar System

Ask Astro: What are the chances of dark matter or a black hole ripping apart Earth?

How do astronomers know that the universe is 13.7 billion years old?