Ouroboros

Astronomers find system with five planets

By Maggie Fox, Health and Science Editor 2 hours, 35 minutes ago

WASHINGTON (Reuters) - NASA scientists said they discovered a fifth planet orbiting a star outside our own solar system and say the discovery suggests there are many solar systems that are, just like our own, packed with planets.

The new planet is much bigger than Earth, but is a similar distance away from its sun, a star known as 55 Cancri, the astronomers said on Tuesday.

Four planets had already been seen around the star, but the discovery marks the first time as many as five planets have been found orbiting a solar system outside our own with its eight planets, said Debra Fischer, an astronomer at San Francisco State University.

Life could conceivably live on the surface of a moon that might be orbiting the new planet, but such a moon would be far too small to detect using current methods, the astronomers said.

"The star is very much like our own sun. It has about the same mass and is about the same age as our sun," Fischer told reporters.

"It's a system that appears to be packed with planets."

It took the researchers 18 years of careful, painstaking study to find the five planets, which they found by measuring tiny wobbles in the star's orbit. The first planet discovered took 14 years to make one orbit.

They said 55 Cancri is 41 light-years away in the constellation Cancer, a light-year being the distance light travels in one year -- about 5.8 trillion miles.

The newly discovered planet has a mass about 45 times that of Earth and may resemble Saturn, the astronomers said.

HARBORING LIFE?

It is the fourth planet out from the star and completes one orbit every 260 days -- a similar orbit to that of Venus.

"It would be a little bit warmer than the Earth but not very much," said Jonathan Lunine, a planetary scientist at the University of Arizona.

The planet is 72 million miles from its star -- closer than the Earth's 93 million miles, but the star is a little cooler than our own sun.

"If there were a moon around this new planet ... it would have a rocky surface, so water on it in principle could puddle into lakes and oceans," said Geoff Marcy, an astronomer at the University of California, Berkeley.

But the moon would have to carry a lot of mass to hold the water, he said. Water is, of course, key to life.

"This discovery of the first-ever quintuple planetary system has me jumping out of my socks," Marcy added. "We now know that our sun and its family of planets is not unusual."

Marcy and other astronomers strongly believe that many stars are hosts to solar systems similar to our own. But small objects such as planets are very hard to detect.

Technology that would allow scientists to detect planets as small as Earth is decades away, the scientists agreed.

The researchers have been looking at 2,000 nearby stars using the Lick Observatory near San Jose, California, and the W.M. Keck Observatory in Mauna Kea, Hawaii.

They have posted images of what the planets may look like on the Internet at http://www.nasa.gov/audience/formedia/telecon-20071106/.

The inner four planets of 55 Cancri are all closer to the star than Earth is to the sun. The closest, about the mass of Uranus, zips around the star in just under three days at a distance of 3.5 million miles.
(Editing by Cynthia Osterman)

DannyBoy

This stuff is very exciting, makes you wonder how people can so naively sling around such toff as "Of course theres not Aliens" and the like. Surely mathmatics alone would give reason to suggest that there must be life somewhere else in the Universe ?. I guess it's easy to sit and say that without knowing all the facts, but im entitled to have such an opinion heh!. What do you think ?, there has to be something else out there... right ?...

Ouroboros

I've witnessed three UFOs on separate occasions. Life is the rule, not the exception.

DannyBoy

UFO's are a trickier one for me. I wouldn't dream of disputing your experiences though and will say I have seen some questionable stuff before (though nevr in real life). They can't all be fake can they, that's my thought on it. Though you have to wonder, if Aliens are smart enough to get out and visit other planets... why come and say hello to a bunch of Barbarians like us ?. lol. Maybe it goes even deeper than we think...

Ouroboros

I dunno. Maybe when they see plutonium, they check things out.

Kana

Perhaps they are filming their own version of a reality TV programme. Survivor: Earth!

Hey, Danny. I just realised I surpassed 300 post count.

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Groovyville

DannyBoy

I wonder if they're what we will be if we survive long enough to evolve further. We'll use up all our natural resources and run our planet dry to the point where we are forced to flee in search of other sources of such things.

DannyBoy

Madness ?... THIS IS KANA!. wtg Kana

Kana

Hahaha! Awesome.

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Groovyville

DannyBoy

I think I just insinuated that you are infact... Mad. Sorry Kana haha.