Angular Diameter

Astronomers have created the largest photomosaic of the Andromeda galaxy yet using Hubble data. The image helps trace the hidden history of Andromeda. The post Andromeda galaxy: Hubble's largest photomosaic yet first appeared on EarthSky.

Our model says one thing; our observations say another.

Even Earth's mightiest telescopes aren't up to the task of imaging Apollo lunar landing sites. A lack of resolution is the biggest reason why

As we make the transition from July into August, Venus has finally begun climbing up out of the sunset glow in earnest and is now about to reclaim its role...

There is a total eclipse and an annular eclipse—and then there's one that's a little bit of both.

Astronomers are gearing up for an unusual celestial event: an asteroid's occultation, or total covering, of an iconic star.

Telescopes at the Cerro Tololo Inter-American Observatory near La Serena, Chile. Guillaume Doyen/CTIO/NOIRLab/NSF/AURA, CC BYNASA's OSIRIS-REx spacecraft...

There will come a time 1.21 billion years from now when the phenomenon of a total eclipse of the sun will become an impossibility.

Our best black hole image ever, inside and out. Some 55 million light-years away lies the giant galaxy Messier 87. Its supermassive black hole, inside and out, looks better than ever..

Our planet's not-quite-circular orbit means that on July 6 we'll be about 2.5 million kilometers farther from the sun than average—but we won't feel any colder

In a way, it was like a call to arms for astronomers.

A new supernova has literally, and figuratively, "burst" upon the scene.

How is the Universe so big, and why does its size seem to be bigger than its age?

Try your hand at making a daytime observation, but make sure to do so with care.

The nearly new moon sidles up to the solar system's largest planet.

A new simulation shows how NASA's Nancy Grace Roman Space Telescope will turn back the cosmic clock, unveiling the evolving universe in ways that have never been possible before when it launches by May 2027. With its ability to rapidly image enormous swaths of space, Roman will help us understand ho

Recently, I have been diving into astrophotography using a Nikon D3300 DSLR camera. Although the camera only has a 24.2 megapixel sensor, it performs well for beginners and I have gotten a lot of u…

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The latest Webb observations do reveal some strange and unexpected things about the universe

June's full Moon was one of the lunar events of the year. Here it is captured by photographers around the world.