UH researchers make another big astronomy discovery
Updated On: Nov 05 2013 08:25:15 AM HST
The University of Hawaii played a big role in another significant astronomical discovery announced Monday.
Astronomers now estimate that one in five stars in our galaxy that are similar to the sun have an earth-like planet.
Over the past four years, NASA's Kepler spacecraft has been scanning the Milky Way galaxy, looking for other planets like ours.
"Kepler looked at 150-thousand stars and it hunted for Earth-like planets around each one of them, and we counted those planets very carefully and we came up with an estimate that about 20 percent of stars like the sun have a planet that's about the size of the Earth, in an orbit that's about like the Earth's orbit," said University of Hawaii Institute for Astronomy faculty member Andrew Howard.
He was one of three scientists associated with the findings, which were published online in the journal "proceedings of the National Academy of Sciences" on Monday.
The team of researchers looked for Earth-sized planets with orbits in a habitable zone. An orbit too close to its star is too hot for life. Too far, too cold.
Howard said the study was far too short to scan all of the stars in the Milky Way.
"You can think of it like taking a census. You don't have time to knock on every single door. So you just knock on one neighborhood's worth of doors and that tells you about the entire population," he said.
"There's a hundred-billion stars in our galaxy. So 20 percent of that is a huge number. that's more Earth-like planets than there are people on the Earth."
But Howard warns, it's unknown how many of these planets are rocky with a similar atmosphere to Earth, making it capable for life.
Just last week, it was announced that Mauna Kea's Keck Observatory found that an Earth-like planet called Kepler-78b is made of rock and iron. It's way too close to its star for life though.
"We don't know around what fraction of them life took hold, but there's certainly a lot of chances for it to do that," said Howard.
The team of researchers say the closest planet to us that's Earth-sized and in a habitable zone is probably only 12 light years away and visible to us with the naked eye.
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