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Astronomy Picture of the Day: Lunar Eclipse over Cologne Cathedral

Why would a bright full Moon suddenly become dark? Because it entered the shadow of the Earth.

Astronomy Picture of the Day: Earthrise 1: Historic Image Remastered

"Oh my God! Look at that picture over there! Here's the Earth coming up. Wow is that pretty!"

Astronomy Picture of the Day: Earthrise: A Video Reconstruction

About 12 seconds into this video, something unusual happens.

Astronomy Picture of the Day: Extraordinary Solar Halos

Welcome to the December Solstice, the first day of winter in planet Earth's northern hemisphere and summer in the south.

Astronomy Picture of the Day: A Rainbow Geminid Meteor

Meteors can be colorful. While the human eye usually cannot discern many colors, cameras often can.

Astronomy Picture of the Day: Methane Bubbles Frozen in Lake Baikal

What are these bubbles frozen into Lake Baikal? Methane. Lake Baikal, a UNESCO World Heritage Site in Russia, is the world's largest (by volume), oldest, and deepest lake, containing over 20% of the world's fresh water.

Astronomy Picture of the Day: Comet Wirtanen Passes by the Earth

Today Comet Wirtanen passes by the Earth. The kilometer-sized dirty snowball orbits the Sun every 5.4 years, ranging as far out as Jupiter and as close in as the Earth.

Astronomy Picture of the Day: Sound and Light Captured by Mars InSight

Your arm on Mars has unusual powers. For one thing it is nearly 2 meters long, has a scoop and grapple built into its hand, and has a camera built into its forearm.

Astronomy Picture of the Day: Aurora Shimmer, Meteor Flash

Some night skies are serene and passive -- others shimmer and flash. The later, in the form of auroras and meteors, haunted skies over the island of Kvaløya, near Tromsø Norway on 2009 December 13.

Astronomy Picture of the Day: Tiny Planet Timelapse

You can pack a lot of sky watching into 30 seconds on this tiny planet. Of course, the full spherical image timelapse video was recorded on planet Earth, from Grande Pines Observatory outside Pinehurst, North Carolina.

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