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Hubble Space Telescope marks 25th anniversary in orbit this week

Scientists discover Earth鈥檚 鈥楽tar Trek鈥�-style invisible shield

Saturn's weird fast-changing ring baffles scientists

Mysterious 'magic island' unveiled as Saturn's moon warms

NASA finds star as cold as North Pole

New poll says Big Bang theory a big question for many Americans

NASA's newest Mars flyer will explore atmosphere

Earth 2? Scientists study rocky, Earth-sized planet 700 light years away

Number of confirmed alien planets nears 1,000

Smallest planet yet found outside solar system