Astronomy Picture of the Day: The Unexpected Trajectory of Interstellar Asteroid 'Oumuamua

Why is 'Oumuamua differing from its expected trajectory? Last year, 1I/2017 U1 'Oumuamua became the first known asteroid from interstellar space to pass through our Solar System.

Astronomy Picture of the Day: Gibbous Moon beyond Swedish Mountain

This is a gibbous Moon. More Earthlings are familiar with a full moon, when the entire face of Luna is lit by the Sun, and a crescent moon, when only a sliver of the Moon's face is lit.

Astronomy Picture of the Day: Creature Aurora Over Norway

It was Halloween and the sky looked like a creature.

Astronomy Picture of the Day: The Tarantula Nebula

The Tarantula Nebula, also known as 30 Doradus, is more than a thousand light-years in diameter, a giant star forming region within nearby satellite galaxy the Large Magellanic Cloud.

Astronomy Picture of the Day: The Hill, The Moon, and Saturn

Last Sunday when the Moon was young its sunlit crescent hung low near the western horizon at sunset.

Astronomy Picture of the Day: Comet 46P/Wirtanen

Periodic Comet 46P/Wirtanen is now the brightest comet in the night sky, but too faint to be seen by eye.

Astronomy Picture of the Day: The Cave Nebula in Hydrogen, Oxygen, and Sulfur

What's inside this cosmic cave? A stellar nursery 10 light-years deep.

Astronomy Picture of the Day: Rotating Asteroid Bennu from OSIRIS-REx

Could this close-by asteroid ever hit the Earth? Eventually yes -- but probably not for a very long time, even though the asteroid is expected to pass inside the orbit of the Moon next century.

Astronomy Picture of the Day: The Lagoon Nebula is Stars, Gas, and Dust

The majestic Lagoon Nebula is filled with hot gas and the home for many young stars.

Astronomy Picture of the Day: Astronaut Exploring: An Apollo 15 Panorama

What would it be like to explore the Moon? NASA's Apollo missions gave humans just this chance in the late 1960s and early 1970s.

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