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Cosmic Journeys: The Search For Earth-Like Planets
YouTube ^ | January 8, 2010 | Uploaded by SpaceRip

Posted on 10/05/2012 6:07:28 PM PDT by SunkenCiv

Cosmic Journeys: The Search For Earth-Like Plan

(Excerpt) Read more at youtube.com ...


TOPICS: Astronomy; Science
KEYWORDS: rareearthisbeeess; xplanets
The search for Earth-like planets is reaching a fever-pitch. Does the evidence so far help shed light on the ancient question: Is the galaxy filled with life, or is Earth just a beautiful, lonely aberration? If things dont work out on this planet Or if our itch to explore becomes unbearable at some point in the future Astronomers have recently found out what kind of galactic real estate might be available to us. Well have to develop advanced transport to land there, 20 light years away. The question right now: is it worth the trip?

If things don't work out on this planet...

Or if our itch to explore becomes unbearable at some point in the future...

Astronomers have recently found out what kind of galactic real estate might be available to us.

We'll have to develop advanced transport to land there, 20 light years away.... But that's for later.

The question right now: is it worth the trip? The destination is a star that you can't see with your naked eye, in the southern constellation Libra, called Gliese 581.

Identified over 40 years ago by the German astronomer Wilhelm Gliese, it's a red dwarf with 31% of the Sun's mass... and only 1.3% of its luminosity.

Until recently, the so-called M Stars like Gliese 581 flew below the radar of planet hunters.

They give off so little energy that a planet would have to orbit dangerously close just to get enough heat.

Now, these unlikely realms are beginning to show some promise... as their dim light yields to precision technologies...

...as well as supercomputers... honed in the battle to understand global changes on this planet... Earth.

Will we now begin to detect signs of alien life?

Or will these worlds, and the galaxy itself, turn out to be lifeless... and Earth, just a beautiful, lonely aberration?

To some, like astronomer and author Carl Sagan, the sheer number and diversity of stars makes it, as he said, "far more likely that the universe is brimming over with life."

This so-called "many worlds" view can be traced back to ancient observers... in China, India, Greece and Egypt. The Qur'an, the Talmud, and many Hindu texts all imagined a universe full of living beings.

In the 16th Century, this view got a boost from astronomer and mathematician Nikolas Copernicus... who came to believe that Earth is not the center of the universe, but revolves around the Sun.

Seven decades after Copernicus, Galileo Galilei used his newly developed telescope to show that our Sun was just one among countless other stars in the universe.

By the modern era, the "many worlds" view held sway in scientific circles. A variety of thinkers considered what and who inhabited worlds beyond our own.

From Martians desperate to get off their planet... to alien invaders intent on launching pre-emptive strikes against ours... or simple life forms on an evolutionary track to complexity.

But other thinkers have been struck by a different view.

The Greek philosophers Aristotle and Ptolemy believed that humans and Earth are unique.

With the spread of Christianity, this Ptolemaic system became widely accepted.

The latest variation on this theme is what's called the "Rare Earth" hypothesis. It holds that Earth and sophisticated life were the result of fortuitous circumstances that may not be easy to find again in our galaxy.

Does the current search for planets shed light on this debate... sending it in one direction or the other?

So far, our only good reference for recognizing an Earth-like planet is... Earth.

It does have some fortuitous characteristics... it's dense, it's rocky -- with a complex make-up of minerals and organic compounds -- and it has lots and lots of water.

It's also got a nearly circular orbit around the Sun, at a distance that allows liquid water to flow... not too close and not too far away, in the so-called "Habitable Zone."

That's defined as the range of distance from a parent star that a planet would need to maintain surface temperatures between the freezing and boiling points of water.

Of course, that depends on the size of the planet, the make-up of its atmosphere, and a host of other factors.

And whether the parent star is large; medium like the Sun; or small.

Some scientists also believe we live in a "Galactic Habitable Zone." We're close enough to the galactic center to be infused with heavy elements generated by countless stellar explosions over the eons...

But far enough away from deadly gamma radiation that roars out of the center.

If there is a galactic habitable zone... it's thought to lie 26,000 light years from the center... about where we are... give or take about 6,000 light years.

1 posted on 10/05/2012 6:07:36 PM PDT by SunkenCiv
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To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; married21; steelyourfaith; Mmogamer; ...

This is an ‘extra, extra’ ping to APoD members as recompense for my having missed yesterday’s upload until today. [blush]


2 posted on 10/05/2012 6:10:06 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: KevinDavis; annie laurie; Knitting A Conundrum; Viking2002; Ernest_at_the_Beach; Mmogamer; ...
 
X-Planets
· join · view topics · view or post blog · bookmark · post new topic · subscribe ·
Google news searches: exoplanet · exosolar · extrasolar ·

3 posted on 10/05/2012 6:10:13 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: SunkenCiv
I made a new one today.

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4 posted on 10/05/2012 6:10:19 PM PDT by cripplecreek (What does it profit a man if he gains the whole world but loses his soul?)
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To: cripplecreek

Nice! Got any that are, say, oceans and desert (with tufts of green around inland lakes, or something)?


5 posted on 10/05/2012 6:12:35 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: SunkenCiv
If there already exists a galactic or semi-galactic confederation and they have found us, they would keep us under observation but conclude we are far away from having our act together.
6 posted on 10/05/2012 6:14:45 PM PDT by AU72
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To: SunkenCiv
Here's one from a while back.

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7 posted on 10/05/2012 6:17:51 PM PDT by cripplecreek (What does it profit a man if he gains the whole world but loses his soul?)
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To: cripplecreek

Cool, you are full of surprises.


8 posted on 10/05/2012 6:19:27 PM PDT by mnehring
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To: SunkenCiv

Somehow this reminds me of the scene from near the end of The Wizard of Zo:

Just click your heels together and repeat: “There’s no home like place”...


9 posted on 10/05/2012 6:25:36 PM PDT by null and void (Day 1354 of our ObamaVacation from reality - Obama, a queer and present danger)
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To: mnehring
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10 posted on 10/05/2012 6:25:36 PM PDT by cripplecreek (What does it profit a man if he gains the whole world but loses his soul?)
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To: SunkenCiv

To explore, strange new worlds...


11 posted on 10/05/2012 6:25:41 PM PDT by BigCinBigD (...Was that okay?)
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To: SunkenCiv
So far, our only good reference for recognizing an Earth-like planet is... Earth.

A data set of one.

Hard to draw any conclusions from that.

Given how fast we are finding new planets and improvements at finding out details about them remotely... we may soon have more data to work with.

This is an amazing time to be alive. When my oldest grandson was born, there were NO confirmed extra-solar planets. I can't keep up with the number they are finding these days.

/johnny

12 posted on 10/05/2012 6:30:04 PM PDT by JRandomFreeper (Gone Galt)
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To: BigCinBigD
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13 posted on 10/05/2012 6:33:35 PM PDT by cripplecreek (What does it profit a man if he gains the whole world but loses his soul?)
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To: AU72
After a while you develop an eye to worked out or partially worked out mining sites ~ and one of the biggest is Earth's continental masses. There they are, huge chunks of silicon filled to the brim with all the elements needed for biological life (we have the code for that in our DNA and that's what we need, so everybody needs the same stuff).

It's not just a solid shell ~ it's broken up ~ a mere 38% of the surface in fact.

Where's the rest of it? Where's the one that used to be on Venus? How about the one on Mercury?

All gone ~ because somebody mined it in the ancient distant past.

14 posted on 10/05/2012 6:33:58 PM PDT by muawiyah
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To: JRandomFreeper
We're also finding planets where we theorized that they couldn't be. The very first was found orbiting a pulsar and now we're finding them in star clusters.

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15 posted on 10/05/2012 6:38:16 PM PDT by cripplecreek (What does it profit a man if he gains the whole world but loses his soul?)
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To: muawiyah
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16 posted on 10/05/2012 6:39:25 PM PDT by cripplecreek (What does it profit a man if he gains the whole world but loses his soul?)
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To: cripplecreek
Yep. In Drake's:

N = R * fp * ne * fl * fi * fc * L

fp is getting some real number input.

/johnny

17 posted on 10/05/2012 6:48:56 PM PDT by JRandomFreeper (Gone Galt)
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To: BigCinBigD

Far away places, with strange sounding names...


18 posted on 10/05/2012 6:51:32 PM PDT by BigCinBigD (...Was that okay?)
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To: SunkenCiv

Bflr


19 posted on 10/05/2012 6:54:06 PM PDT by MattinNJ (Romney? Really? Seriously?)
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To: SunkenCiv
I like to make surfaces as well. Think of this one in the process of terraforming.

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20 posted on 10/05/2012 6:56:19 PM PDT by cripplecreek (What does it profit a man if he gains the whole world but loses his soul?)
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To: BigCinBigD
Far away places, with strange sounding names...

You sound like a recruiter. ;)

/johnny

21 posted on 10/05/2012 7:00:27 PM PDT by JRandomFreeper (Gone Galt)
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To: cripplecreek
Based on Mars?

/johnny

22 posted on 10/05/2012 7:01:58 PM PDT by JRandomFreeper (Gone Galt)
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To: JRandomFreeper

Could be based on mars or any arid planet I suppose.


23 posted on 10/05/2012 7:12:22 PM PDT by cripplecreek (What does it profit a man if he gains the whole world but loses his soul?)
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To: cripplecreek
I've said it before, I'll say it again. You do good work.

I've been looking at a lot of pix of Mars recently, and some of the features looked familiar. Brains look for patterns, whether they are there or not... I know.

/johnny

24 posted on 10/05/2012 7:29:16 PM PDT by JRandomFreeper (Gone Galt)
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To: JRandomFreeper

No doubt about it. :’) The rate is large, and growing larger. This will go on for a while. Then the next-gen of orbital observatories will start kicking in more and more data.


25 posted on 10/05/2012 7:41:39 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: cripplecreek

Nice!


26 posted on 10/05/2012 7:42:43 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: AU72

We can’t know, but it’s hard to defend that we’ve got our act together. :’D


27 posted on 10/05/2012 7:47:23 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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To: SunkenCiv
Don't forget President Romney's favorite planet.


28 posted on 10/05/2012 7:50:22 PM PDT by garjog (We do not want another four more years of the last four years.)
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To: garjog

This one of yours is better:
Romney-Ryan 2012

29 posted on 10/06/2012 1:45:03 AM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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