S. Korea says second spy satellite placed in orbit

South Korea put its second domestically made spy satellite into orbit, Seoul's defense ministry said Monday, after it launched from an American space center on a SpaceX Falcon 9 rocket.

What do scientists hope to learn from total solar eclipse in US?

When a rare total solar eclipse sweeps across North America on Monday, scientists will be able to gather invaluable data on everything from the sun's atmosphere to strange animal behaviors—and even possible effects on humans.

The universe's accelerated expansion might be slowing down

The universe is still expanding at an accelerating rate, but it may have slowed down recently compared to a few billion years ago, early results from the most precise measurement of its evolution yet suggested Thursday.

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