Astronomy Staff, Author at Astronomy.com | Page 8 of 278

The very center of globular cluster NGC 6397

How do globular clusters remain intact for so long?

The Tucson Astronomy Festival has hands'-on activities for kids. Credit: Tuscon Amateur Astronomy Association.

Observing, Upcoming Events

Tucson Amateur Astronomy Association to host a free festival March 30

The makeup of the universe

Are the percentages of dark matter and dark energy stable?

A screenshot of NASA's livestream of the eclipse before the eclipse.

2024 Solar Eclipse, Observing, Upcoming Events

How to watch the solar eclipse online

Credit: NASA/JPL-Caltech.

Exotic Objects, Galaxies

How does a black hole get to the center of a galaxy, and does the galaxy revolve around it?

Albireo

Why are there no green stars?

Active Region 13055 on the Sun

Solar System, Stars

What causes sunspots?

Mars InSight solar panel covered with dust

Robotic Spaceflight

Why doesn’t NASA build a mechanism to clean the solar panels on its Mars rovers?

Antennas of the Very Large Array

Can astronomers do their work during the day?

Where is the center of the universe?

This illustration shows the approximate sizes of the planets relative to each other. The planets are not shown at the appropriate distance from the Sun. Credit: NASA.

The best times to see planets with a small telescope

Cover of Astronomy's Sky Guide 2024

Observing, Upcoming Events

Your guide to the sky in 2024