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Celestial Objects to Observe

M13 with a Side of Galaxies, Please

The Great Hercules Cluster is on everyone's observing list this summer. But there's lots more to see within a stone's throw of this grand object — like 20 galaxies!

Explore the Night with Bob King

Meet the Shy Side of the Local Group

The Local Group galaxies and their kin are the building blocks of the most magnificent galaxies in the universe. Let them inspire your winter nights.

Celestial Objects to Observe

Are You Ready, Willing, and Abell?

A cosmic rabbit hole in the tail of Leo will take you to Abell 1367, a wonderland of galaxies more than 300 million light-years from Earth. Step in and lose yourself in the vastness.

super spiral and normal galaxies

Galaxies

Super Spiral Galaxies

Astronomers have identified 53 “super spirals” — spiral galaxies that are huge and incredibly luminous — as part of a project exploring archived observations.

Ripples in the Milky Way's Disk

Milky Way

A Galaxy Hit-and-Run

Ripples found in the Milky Way’s disk reveal our galaxy survived an ancient hit-and-run. Now, astronomers might have caught the culprit.

Galaxies

Question Reopened: How do Galaxies Grow?

Evidence from observations sheds doubt on cosmic cannibalism as a source for galaxy growth, suggesting that instead galaxies grow by pulling in gas from the intergalactic medium.

Science-based Q&A

How Many Galaxies Are There in the Universe?

Astronomers determine the number of galaxies in the universe by counting up the number visible in a tiny portion of the sky, and then accounting for all the regions of the observable universe. A 2013 study estimates that there are 225 billion galaxies in the observable universe.

urban observer

Celestial Objects to Observe

Observing Secrets of Deep-Sky Objects Revealed

Here's how to hone your galaxy-hunting skills — and what to expect at the eyepiece.

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