Best NASA Astronomy Pictures of the Week: Aurora, Green flash sunset, Nebula and more

NASA publishes its Astronomy Picture of the Day on a daily basis, featuring mesmerizing photographs taken by astrophotographers from all over the world. This week's pictures include the Crab Nebula, Andromeda Galaxy and more.

Geomagnetic storm sparks auroras (March 27) - Millions of people in the US witnessed the magnificent Northern Lights triggered by a strong geomagnetic storm, which served as the catalyst. Even NASA's Astronomy Picture of the Day for March 27 is dedicated to a mesmerizing view of an Aurora over the Arctic. (NASA/Cari Letelier)

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1/5 Geomagnetic storm sparks auroras (March 27) - Millions of people in the US witnessed the magnificent Northern Lights triggered by a strong geomagnetic storm, which served as the catalyst. Even NASA's Astronomy Picture of the Day for March 27 is dedicated to a mesmerizing view of an Aurora over the Arctic. (NASA/Cari Letelier)

Rare Green Flash Sunset (March 28) - It is a fascinating snapshot of a multiple green flash sunset captured from the Cerro Tololo Inter-American Observatory in Chile last April. As the Sun sets on the horizon and disappears from view during sunset, sometimes a green flash may appear. (NASA/T. Slovinský/P. Horálek/CTIO)

2/5 Rare Green Flash Sunset (March 28) - It is a fascinating snapshot of a multiple green flash sunset captured from the Cerro Tololo Inter-American Observatory in Chile last April. As the Sun sets on the horizon and disappears from view during sunset, sometimes a green flash may appear. (NASA/T. Slovinský/P. Horálek/CTIO)

Dolphin-Head Nebula (March 29) - It is the Dolphin-Head nebula, located about 5000 light-years away from Earth towards the constellation of Canis Major, also known as the Big Dog. This weirdly fascinating nebula is about 70000 years old and spans almost 60 light-years across, as per NASA. The Dolphin-Head nebula has been catalogued as Sh2-308. (NASA/Aleix Roig (AstroCatInfo))

3/5 Dolphin-Head Nebula (March 29) - It is the Dolphin-Head nebula, located about 5000 light-years away from Earth towards the constellation of Canis Major, also known as the Big Dog. This weirdly fascinating nebula is about 70000 years old and spans almost 60 light-years across, as per NASA. The Dolphin-Head nebula has been catalogued as Sh2-308. (NASA/Aleix Roig (AstroCatInfo))

Globular star cluster and Dark Doodad Nebula (March 30) - It is the Dark Doodad Nebula which lies beside the globular star cluster NGC 4372. Also known as Caldwell 108, the globular star cluster is located about 19000 light-years away in the constellation Musca. It was discovered in 1826 by the Scottish astronomer James Dunlop from his observation post in Australia. (NASA/ESA/Hubble Telescope)

4/5 Globular star cluster and Dark Doodad Nebula (March 30) - It is the Dark Doodad Nebula which lies beside the globular star cluster NGC 4372. Also known as Caldwell 108, the globular star cluster is located about 19000 light-years away in the constellation Musca. It was discovered in 1826 by the Scottish astronomer James Dunlop from his observation post in Australia. (NASA/ESA/Hubble Telescope)

Saturn's Moon Titan (March 31) - It is a snapshot showing 6 faces of Titan. Titan has a radius of about 2575 kilometers and is nearly 50 percent wider than Earth's moon. Saturn's icy moon is about 1.2 million kilometers away from Saturn, which itself is about 1.4 billion kilometers from the Sun. (NASA/ESA/VIMS Team)

5/5 Saturn's Moon Titan (March 31) - It is a snapshot showing 6 faces of Titan. Titan has a radius of about 2575 kilometers and is nearly 50 percent wider than Earth's moon. Saturn's icy moon is about 1.2 million kilometers away from Saturn, which itself is about 1.4 billion kilometers from the Sun. (NASA/ESA/VIMS Team)