Meteor crater

When you see spacecraft images of craters on other worlds, do you sometimes think they look like domes? Here's how to change your perception.

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The aliens have landed, time and time again since the world began. Not the "little green men" of science fiction, but rocky leftovers from the birth of the solar system: meteors and asteroids. While most records of their impacts have been eroded away over the vast expanse of geological time, many so-called astroblemes remain. Here are 10 of the most noteworthy.

Meteor Crater (Barringer Crater) near Winslow, Arizona - First noted by settlers in the late 19th century, it was debated as either a meteor crater or of volcanic origin until Eugene Shoemaker, of Comet Shoemaker-Levy9 fame, presented conclusive evidence that it must have been a meteor impact - estimated to be about 50,000 years old.

Whether they were formed by volcanic eruptions or meteorite impacts, these 15 crater lakes harbor a special kind of beauty.

Smithsonian picks the top natural wonders in the continental United States

Meteor Crater, Arizona

Lonar Crater Lake was formed around 570,000 yrs ago from a meteor impact. It is categorized as a saline soda lake, because of a high concentration of carbonate salts. Buldana district in Maharashtra

There is a sense of humor around every corner when you're driving in America. How else to explain those wacky, way-out-in-left-field roadside attractions you’ll stumble upon? Muffler men, mystery spots and antigravity hills are just the beginning. Here are our top 10 favorite offbeat spots: what are yours?

Our planet is covered in pockmarks so deep that they can be seen from space. Some were caused by asteroid strikes, but most are the result of human meddling. Here are some of the most incredible examples of the scarred Earth.