Magazine | Page 201 of 280 | Astronomy.com

If a black hole crossed in front of a background star, could we see the black hole and determine its size?

Human Spaceflight

What are the health risks of a Mars mission?

What determines the particular shape of nebulae like the Dumbbell, Trifid, and Lagoon?

Who first measured the speed of light? What method was used?

Stephen James O’Meara’s Secret Sky: Moonbows: architecture of light

Glenn Chaple’s Observing Basics: Solar safety

Stephen James O’Meara’s Secret Sky: Magic times on the Sun

Ask Astro web extra: Why does the Moon look so large sometimes as it rises on the horizon?

More Salman Sharpless objects

A dying star gives birth to planets

Is it possible to combine digitized observations of an object from widely separated telescopes, creating a virtual interferometer?

Is there an equivalent to the North Star in the Southern Hemisphere?