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An artist's rendition of the new discovery of the three new planets, orbiting a star previously thought to hold none.  (Source: ESO)
More new Earth like planet discoveries pour in

Planets just aren't quite as unique as they once were thought to be.  During the medieval times, it was thought that the Earth was the center of the universe about which the sun and planets rotated. 

With time it was realized that the Earth was just one of the solar planets orbiting the sun, but skepticism that planets existed outside the solar system remained strong.  However, with the advent of new techniques and more power telescopes researchers began to discover extrasolar planets at a rapid pace, starting in the 1988, with the discovery of planets orbiting the star Gamma Cephei.  Meanwhile a large new orbiting body was discovered on the fringes of our own system, while Pluto was downgraded to a mere "Plutoid".

Some of these planets were deemed somewhat Earth-like in that they were smaller than gas giants, might have water, and could be made to be habitable.  Other extrasolar planets were similar in size to Earth, but were way to hot to inhabit with current technologies.

Now European astronomers have continued the run of discoveries of smaller planets with the discovery of a trio of "super-Earths" rotating around the star HD 40307, located 42 light-years from Earth towards the southern Doradus and Pictor constellations.  The new planets have masses of 4.2, 6.7, and 9.4 times the mass of Earth and orbits of 4.3, 9.6, and 20.4 days respectively.

The star they orbit is a normal star, approximately the same size as our sun.  According to Didier Queloz and Michel Mayor, expert planet hunters who led the discovery team, the planets are too hot to support life as we know it.

However, despite this slight disappointment, the discovery raises the intriguing possibility of a so-called "crowded universe" teeming with undiscovered planets.  HD 40307 was long thought to hold no planets -- it is clear now that the discovery was only possible with the advances in detection.  There are likely many smaller planets that have yet to be detected.  In total 270 extrasolar planets have already been found.

Stéphane Udry, a colleague of Mayor, describes the advance stating, "With the advent of much more precise instruments such as the HARPS spectrograph on ESO's 3.6-m telescope at La Silla, we can now discover smaller planets, with masses between 2 and 10 times the Earth's mass."

Mayor who works at the Geneva Observatory states, "Does every single star harbour planets and, if yes, how many?  We may not yet know the answer but we are making huge progress towards it.  Clearly these planets are only the tip of the iceberg.  The analysis of all the stars studied with HARPS shows that about one third of all solar-like stars have either super-Earth or Neptune-like planets with orbital periods shorter than 50 days."

The slowly unfolding picture of a universe full of planets brings two key possibilities.  First, the possibility of expansion and colonization outside the solar system, and secondly, the possibility of extraterrestrial life.



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RE: If space is so massive...
By MrPoletski on 6/18/2008 2:55:50 PM , Rating: 2
It was scientists not religious types that came up with the earth being the centre of the universe huh?

First of all, science as a 'job' barely existed back then.

Also, why was it then, that Galileo (who played a major role in the scientific revolution) was arrested by the inquisition for his 'non centre of the universe' ideas (having observed other planets). His work banned from being published. The idea that the earth moved aroudn the sun deemed heretical.

And:
quote:
Psalm 93:1, Psalm 96:10, and 1 Chronicles 16:30 include text stating that "the world is firmly established, it cannot be moved." In the same tradition, Psalm 104:5 says, "the LORD set the earth on its foundations; it can never be moved." Further, Ecclesiastes 1:5 states that "And the sun rises and sets and returns to its place, etc."[87]


When was that written?

quote:
What . . . in the face of overwhelming evidence to the contrary? I mean, if there were other living beings in our universe why haven't they evolved far enough to make contact with us?


Why havent we? and who would want to contact us anyway? How do we know they haven't tried? transmitting radio waves across the galaxy takes years and years. There might actually be *no* solution to breaking the light barrier.

quote:
Or at least create structures in space that we could detect? The universe is billions of years old. If life existed outside of Earth, I would expect that there would be some very convincing evidence of that.


We have only just managed to start detecting planets 5x the size of earth around other stars, give us a chance!

What, for example, evidence have we given about our existance out to other solar systems? None. All the radio transmissions we sent out since 1958 will have only travelled 50 light years, reaching precious few solar systems and at infanitessimal power levels.

Besides, I imagine a super intelligent species would do exactly what we do with vastly inferior beings. Watch them like ants to learn about them, but don't mess with them otherwise you screw your science experiment up.


RE: If space is so massive...
By phattyboombatty on 6/18/2008 3:20:37 PM , Rating: 2
quote:
I imagine a super intelligent species would do exactly what we do with vastly inferior beings. Watch them like ants to learn about them, but don't mess with them otherwise you screw your science experiment up.

Why do you assume a super-intelligent species would do the same thing as a vastly inferior being? Based on your premise, ants must also be observing inferior species, but not messing with them, because it would mess up their science experiments.

It's pretty riduculous for the "inferior" being to try to postulate what the "superior" being would do in the same situation.


RE: If space is so massive...
By phattyboombatty on 6/18/2008 3:23:57 PM , Rating: 2
And I forgot to add that I doubt there is any other intelligent beings in the universe that can compete with our level of arrogance. I'm sure the smartest person in the universe would agree with me on this point.


RE: If space is so massive...
By masher2 (blog) on 6/18/2008 10:42:37 PM , Rating: 2
The belief that mankind is the smartest/most arrogant/most evil/most violent/most (insert whatever here) is just a variant of the same anthropomorphic philosophy that had us all believing the sun and stars rotated around the earth, and the planet was created just for our own enjoyment.


RE: If space is so massive...
By MrPoletski on 6/19/2008 4:55:43 AM , Rating: 2
Because ant's don't have the mental capacity for experimental observation of other species? We probably don't have the intelligence to comprehend the kinds of experiments a vastly more advanced race would perform on us - but you can bet we'd try and screw it up somehow if we found out they were doing it.

We regularly analyse behaviour/responses and such of lesser species because in some situations we can use them as 'simple' models to describe ourselves.


RE: If space is so massive...
By sqrt1 on 6/18/2008 10:55:05 PM , Rating: 2
Quick! be sure to send emails to all the news outlets saying that because they use the words "sunrise and sunset" in their reports - they must believe that the sun rotates around the earth!

Actually, there is no absolute frame of reference in space. I know, I'm on Earth so I'll use it as a frame of reference.

Egad! the Sun does orbit the Earth! QED.


RE: If space is so massive...
By masher2 (blog) on 6/18/2008 11:51:25 PM , Rating: 2
> "Actually, there is no absolute frame of reference in space. I know, I'm on Earth so I'll use it as a frame of reference"

Relativity holds only for non-rotating frames of reference. I know you were being facetious, but if one uses the earth as a frame of reference to show the sun rotating around it, one gets some *very* strange results from the equations of motion.


RE: If space is so massive...
By sqrt1 on 6/19/2008 4:13:48 AM , Rating: 2
Perhaps I am being ignorant here, but what I meant was Earth's "axis" as the frame of reference. (eg. 365.25 days for the Sun to orbit the earth)

It all makes a lot more sense if the only two bodies you are modeling are the Sun and Earth.


RE: If space is so massive...
By masher2 (blog) on 6/19/2008 7:36:57 AM , Rating: 2
> "Perhaps I am being ignorant here, but what I meant was Earth's "axis" as the frame of reference"

Right, but the position of that axis is itself revolving around the sun, which makes it a non-inertial frame of reference.


RE: If space is so massive...
By sqrt1 on 6/19/2008 8:06:36 AM , Rating: 2
Yes, the Earth axis that rotates around the Sun, roughly every 27 days. (from the Suns' frame of reference) Glad that is cleared up...


By Shane McGlaun (blog) on 6/21/2008 12:08:41 AM , Rating: 2
Even the Vatican says alien life may be possible.

http://news.bbc.co.uk/2/hi/europe/7399661.stm


"I f***ing cannot play Halo 2 multiplayer. I cannot do it." -- Bungie Technical Lead Chris Butcher

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