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Astronomy Picture of the Day: Rings Around the Ring Nebula

There is much more to the familiar Ring Nebula (M57), however, than can be seen through a small telescope.

Astronomy Picture of the Day: Star Trails and the Bracewell Radio Sundial

Sundials use the location of a shadow to measure the Earth's rotation and indicate the time of day.

Astronomy Picture of the Day: Symbiotic R Aquarii

You can see it change in brightness with just binoculars over the course of a year.

Astronomy Picture of the Day: Road to Mars

What's that light at the end of the road? Mars.

Astronomy Picture of the Day: Hayabusa2 Approaches Asteroid Ryugu

It looks like a big space diamond -- but with craters.

Astronomy Picture of the Day: Complex Jupiter

How complex is Jupiter? NASA's Juno mission to Jupiter is finding the Jovian giant to be more complicated than expected.

Astronomy Picture of the Day: Reflections of Venus and Moon

Posing near the western horizon, a brilliant evening star and slender young crescent shared reflections in a calm sea last Thursday after sunset.

Astronomy Picture of the Day: Kepler's House in Linz

Four hundred years ago today (May 15, 1618) Johannes Kepler discovered the simple mathematical rule governing the orbits of the solar system's planets, now recognized as Kepler's Third Law of planetary motion.

Astronomy Picture of the Day: The Observable Universe

How far can you see?

Astronomy Picture of the Day: Moon Halo over Stone Circle

Have you ever seen a halo around the Moon?

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