Magazine | Page 8 of 278 | Astronomy.com

The expanding universe

How can the visible universe be 46 billion light-years in radius when the universe is only 13.8 billion years old?

Telescopes and Equipment

Explore the sky with Celestron’s autoguider

Merging black holes

When black holes merge, is the diameter of the new black hole bigger?

Painted in 1690 by Thomas Murray, this portrait features young Edmond Halley holding a paper with a diagram of an elliptical orbit.

Science, Solar System

Edmond Halley: The man behind the comet

This view of Earth rising over the Moon's horizon was taken from the Apollo 11 spacecraft. Credit: NASA.

Human Spaceflight, Science

Why do pictures of Earth taken from the Moon show a black sky with no stars?

The Orion Arm hangs in the sky over the Okie-Tex Star Party in this two-minute exposure taken at ISO 3200. All images were shot with an astromodified Canon EOS 6D and 16–35mm f/2.8 zoom lens unless otherwise noted. Credit: Adrian Bradley

Astrophotography

Chasing nightscapes: Tips for taking wide-field shots of the land and sky

Now far from the Sun in the outer solar system, the strange interstellar object known as ‘Oumuamua is depicted here as it’s approached by a questing spacecraft. Project Lyra is hoping to launch such a craft to explore our first known visitor from another solar system and provide the detailed study scientists desperately seek.

Exotic Objects, Space Exploration

‘Oumuamua: Can we catch an interstellar interloper?

An Apollo 15 image of Lambert Crater with Mons Undset to its west (right, where we've added a circle) casting a pyramidal shadow. Mons Undset was named for novelist Sigrid Undset. Credit: NASA

The mystery of a pyramid-like mountain on the Moon missing its name

HST image of Jupiter near opposition

Science, Solar System

How old is each planet in our solar system?

Artist's concept of Planet X

Could we find Planet Nine using JWST?

Robotic Spaceflight, Science

A visit to the cutting-edge Southwest Research Institute

Astrophotography, Deep-Sky Objects

Astrophotography and the art of collaboration