琴声有丽

Of the thousands of known comets in the solar system, Halley's comet is one of some 200 that are periodic. Halley's comet orbits Earth every 76 years; the next flyby will occur in 2061. Comet C/20...

Minerals, algae, and cyanobacteria give this geyser in Nevada's Black Rock Desert its brilliant colors.viMory: cyanobacteria  青藻Lacking virtually any wildlife that could be harmed with its...

Although the archaeological discovery of Machu Picchu came nearly a hundred years ago, historians are still unsure of the function of this ancient Inca citadel. The Inca had no system of writing an...

ChinaThe rocket carrying Shenzhou VI, the PRC's last successful manned venture into space, stands in its assembly bay at a factory in Jiuquan, shortly before its October 12, 2005 launch. China has an...

Shocks of lightning split a cloud formation over Lake Tanganyika in Tanzania. Tanzania's neighbor, the Democratic Republic of Congo, is home to the world's most lightning-pelted region, which, accord...

This famous "Blue Marble" shot represents the first photograph in which Earth is in full view. The picture was taken on December 7, 1972, as the Apollo 17 crew left Earth’s orbit for the moon. With t...

Perched above the lighted city of Catania, Italy, Mount Etna hurls a fountain of fire skyward as rivers of lava spill down its flanks. In spite of its dazzling displays, Mount Etna is a relatively sa...

While most stars end up as white dwarfs or neutron stars, black holes are the last evolutionary stage in the lifetimes of enormous stars that had been at least 10 or 15 times as massive as our own sun...

When large meteorites strike Earth, as pictured above in an artist's conception, they often vaporize and change the ratio of certain chemicals in ocean water and sediments.A new technique that an...

V838 Monocerotis star showing light echo effectviMory:  Monocerotis  麒麟星座Glowing cosmic debris resembling a pearl necklaceShredded, colorful remains of a supernovaArtist's renderin...