Our galaxy is so large that, if traveling at the speed of light, it would take 100,000 years to cross it and it's not the only galaxy in the universe. The vastness of the universe causes many people to wonder, is anybody else out there?
The Vatican asked the same question in a recent five-day summit on the possibility of alien life.
Chris Impey attended the summit and spoke to T.J. Holmes on CNN's American Morning Friday.
The upcoming movie '2012' is based on what happens when the Mayan calendar ends. The film predicts chaos on earth in the title year.
Scientists said the idea of the world ending in 2012 is nonsense but that hasn't stopped the doomsday chatter.
Jim Gargin, the chief scientist at the NASA Goddard Space Flight Center spoke to T.J. Holmes on CNN's American Morning Friday.
Hospitals across the country have been hit hard by the H1N1 virus. Federal health officials recently said that nearly 4,000 people have died from the virus and around 22 million people have had it.
Drs. Sanjay Gupta, Becky Roberts, Christina Johns spoke to Kiran Chetry on CNN's American Morning Friday about how emergency rooms have been affected by swine flu.
Editor's note: This is the first in a yearlong CNN series, "Counting Down Cady," that follows NASA astronaut and mother Catherine "Cady" Coleman as she prepares for a November 2010 trip to the international space station. Watch the first "Counting Down Cady" TV segment Monday morning on CNN's "American Morning." Follow her story on the amFIX blog.
By Kim Segal and John Zarrella, CNN
Shelburne Falls, Massachusetts (CNN) - At her home in this woodsy town east of the Berkshires, Catherine "Cady" Coleman often steps outside with her husband and son to peer at the night sky.
But they're not just stargazing. They look up to catch a glimpse of the international space station as it passes 250 miles overhead.
"We watch it together," Coleman adds wistfully. " I like to think about that fact that [son] Jamey and [husband] Josh might do that when I'm up there."
That's right. A year from now, if everything goes according to plan, Coleman will blast off on a Russian Soyuz rocket for the station, where she will live for the next six months.
It's a tricky balancing act. One day Coleman is cooking dinner and picking up Jamey's toys; the next, she's a NASA astronaut in Houston, Texas, preparing to orbit the Earth at 17,000 miles per hour.
Taking on this mission to space, Coleman says, was a family decision.
"To decide to go and fly on the space station is basically a five-year commitment for me to stay down in Houston, and not live in the same place as these guys," she tells CNN.