The night sky presides over a cherry tree in Yamanashi Prefecture, Japan, on April 12.

The mayor of Tokyo presented 3,000 cherry trees to Washington, D.C., in 1912 as a sign of friendship between Japan and the U.S. The annual National Cherry Blossom Festival honors that gift.

View Images PHOTOGRAPH BY ELISABETTA ROSSO, NATIONAL GEOGRAPHIC YOUR SHOT

Auroras light up the night sky near Stokksnes, Iceland, on April 12. Elisabetta Rosso captured the image—which she submitted to YourShot—the night before her birthday. (See more pictures of auroras.)

View Images PHOTOGRAPH BY NASA/JPL-CALTECH/UNIV. OF ARIZONA

NASA's Mars Reconnaissance Orbiter caught the trail of tracks left by the Curiosity rover on April 11. The tracks, which run from the top left to the bottom third of the image, lead to a small 16-foot (5-meter) rise dubbed Mount Remarkable.



Researchers wanted a closer look at the rocky outcrop surrounding Mount Remarkable before deciding whether to have Curiosity drill for samples. (See "Mars Rover Curiosity Completes First Full Drill.")

View Images PHOTOGRAPH BY FRED HERRMANN, NATIONAL GEOGRAPHIC YOUR SHOT

NGC 3718 (at right) is a warped spiral galaxy embedded in the Ursa Major constellation. According to NASA, gravity exerted on NGC 3718 by its neighbor, NGC 3729 (at left), is probably responsible for the twisting and stretching of the galaxy's arms.



Astrophotographer Fred Herrmann submitted this image to YourShot on April 11. (Listen to how he gets the shot.)

View Images PHOTOGRAPH BY NASA EARTH OBSERVATORY

A NASA satellite captured an image of Klyuchevskaya Volcano on Russia's Kamchatka Peninsula (map) on April 14.



Klyuchevskaya is a stratovolcano, known for eruptions that produce pyroclastic flows. Toxic gases and volcanic fragments characterize these flows, and can barrel down the side of a volcano at hurricane-force speeds. (See "Pictures: When Snow and Ice Meet Lava.")

View Images PHOTOGRAPH BY BABAK TAFRESHI, TWAN