December 31, 2008
December 30, 2008
Dec. 30: An exhaustive NASA review of the Shuttle Columbia disaster revealed troubling details that the agency hopes will improve equipment and protocols for future space crews. NBC's Tom Costello reports. (Nightly News)
December 29, 2008
For the past quarter century, dark matter has been a mystery we've just had to live with. But the time may be getting close when science can finally unveil what this befuddling stuff is that makes up most of the matter in the universe.
December 26, 2008
Time will stand still for one second on New Year's Eve, as we ring in the New Year on Wednesday night. As a result, you'll have an extra second to celebrate because a "Leap Second" will be added to 2008 to let a lagging Earth catch up to super-accurate clocks.
Acclaimed for its ink black skies, Death Valley, the hottest place in North America, also ranks among the nation's unspoiled stargazing spots. But the vista in recent years has grown blurry. The glitzy neon glow from Las Vegas and its burgeoning bedroom communities is stealing stars from the park's eastern fringe.
December 24, 2008
"Nightly News" video: For many, 1968 was a tumultuous time marked by war, assassination, civil unrest and deep political division. But as the year came to a close, the flight of Apollo 8 gave the nation an occasion to soar. NBC’s Brian Williams reports. (Nightly News)