APOD: Artistic Impression: The Surface of... (2017 Jun 26)

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APOD: Artistic Impression: The Surface of... (2017 Jun 26)

Postby APOD Robot » Mon Jun 26, 2017 4:05 am

Image Artistic Impression: The Surface of TRAPPIST-1f

Explanation: If you could stand on the surface of the newly discovered Earth-sized exoplanet TRAPPIST-1f, what would you see? Presently, no Earthling knows for sure, but the featured illustration depicts a reasoned guess based on observational data taken by NASA's Sun-orbiting Spitzer Space Telescope. In 2017, four more Earth-sized planets were found by Spitzer, including TRAPPIST-1f, in addition to three discovered in 2015 from the ground. From the planet's surface, near the mild terminator between night and day, you might see water, ice, and rock on the ground, while water-based clouds might hover above. Past the clouds, the small central star TRAPPIST-1 would appear more red than our Sun, but angularly larger due to the close orbit. With seven known Earth-sized planets -- many of which pass near each other -- the TRAPPIST-1 system is not only a candidate to have life, but intercommunicating life -- although a preliminary search has found no obvious transmissions.

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RocketRon

Re: APOD: Artistic Impression: The Surface of... (2017 Jun 26)

Postby RocketRon » Mon Jun 26, 2017 5:30 am

APOD Robot wrote:is not only a candidate to have life, but intercommunicating life -- although a preliminary search has found no obvious transmissions


What are the odds of any extra-terrestrial life actually having any "communication" capability. ??

Life on earth has been going for how many millions/billions of years now, and its only in the past 150 odd years or so that human-based electromagnetic activity has been active.
Unless you include the flickering light of cooking fires, which extends the timespan somewhat.
We may already have been excluded from the search for "intelligent" life.
Missed us by that much.... ?

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Re: APOD: Artistic Impression: The Surface of... (2017 Jun 26)

Postby Ann » Mon Jun 26, 2017 6:49 am

It's an evocative illustration. I like it.

What are the chances that there is liquid surface water on a planet inside its star's habitable zone? Better than 50%? Worse than 50%?

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Re: APOD: Artistic Impression: The Surface of... (2017 Jun 26)

Postby Boomer12k » Mon Jun 26, 2017 7:20 am

They laughed at me back in the 70's... now they are finding them left and right... :lol2:
Many even in the same system.... I'm 8-)

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Re: APOD: Artistic Impression: The Surface of... (2017 Jun 26)

Postby APODFORIST » Mon Jun 26, 2017 9:04 am

This (artistic impressioned) sun looks scary. Probably the lifeforms are very religious - or - very good informed about astromomical laws by watching their nearby sister planets so close.

douglas

Re: APOD: Artistic Impression: The Surface of... (2017 Jun 26)

Postby douglas » Mon Jun 26, 2017 9:12 am

RocketRon wrote:
APOD Robot wrote:is not only a candidate to have life, but intercommunicating life -- although a preliminary search has found no obvious transmissions


What are the odds of any extra-terrestrial life actually having any "communication" capability. ??



https://en.wikipedia.org/wiki/Murasaki_(novel)

douglas

Re: APOD: Artistic Impression: The Surface of... (2017 Jun 26)

Postby douglas » Mon Jun 26, 2017 9:15 am

The artist could have felt free to make the sun a bit redder, especially seeing as it's low on the horizon?!

Geez, if only these "artists" would check in with me first, such "sloppiness" .. or is it PR fatigue? maybe corporate "hysteria" fatigue? :ssmile:

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Re: APOD: Artistic Impression: The Surface of... (2017 Jun 26)

Postby neufer » Mon Jun 26, 2017 10:59 am

RocketRon wrote:
APOD Robot wrote:
is not only a candidate to have life, but intercommunicating life
-- although a preliminary search has found no obvious transmissions

What are the odds of any extra-terrestrial life actually having any "communication" capability. ??
https://en.wikipedia.org/wiki/Contact_(novel) wrote:
<<"Project Argus" discovers a repeating series of [the first] 26 prime numbers coming from the Vega system 25 light years away.>>
https://oeis.org/A287148 wrote:
Sequence A287148: Number of compositions (ordered partitions) of 2n-1 into primes of form x2 + y2 (A002313). In other words: a(n) is the number of compositions of the n-th odd number into primes of form x2 + y2.

0, 0, 1, 2, 3, 4, 6, 9, 15, 24, 37, 58, 92, 149, 243, 393, 629, 1004, 1603, 2564, 4106, 6571, 10508, 16807, 26895, 43060, 68952, 110392, 176696, 282798

Note that by definition a(4)..a(10) = [2, 3, 4, 6, 9, 15, 24] is the number of compositions (ordered partitions) of [7, 9, 11, 13, 15, 17, 19] respectively, into primes of form x2 + y2. On the other hand a(4)..a(10) = [2, 3, 4, 6, 9, 15, 24] is also the number of laps related to the orbital resonances of the seven Earth-sized planets [h, g, f, e, d, c, b] in the planetary system of the TRAPPIST-1 star.>>
https://en.wikipedia.org/wiki/TRAPPIST-1 wrote:
<<The orbital motions of the TRAPPIST-1 planets form a complex chain with three-body Laplace-type resonances linking every member. The relative orbital periods (proceeding outward) approximate whole integer ratios of 24/24, 24/15, 24/9, 24/6, 24/4, 24/3, and 24/2, respectively, or nearest-neighbor period ratios of about 8/5, 5/3, 3/2, 3/2, 4/3, and 3/2 (1.603, 1.672, 1.506, 1.509, 1.342, and 1.519). This represents the longest known chain of near-resonant exoplanets, and is thought to have resulted from interactions between the planets as they migrated inward within the residual protoplanetary disk after forming at greater initial distances. The resonant chain has been shown to be necessary to keep the tightly packed system stable for long timescales, and the tight correspondence between whole number ratios in orbital resonances and in music theory has made it possible to convert the system's motion into music.>>
Last edited by neufer on Mon Jun 26, 2017 11:36 am, edited 1 time in total.
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Re: APOD: Artistic Impression: The Surface of... (2017 Jun 26)

Postby neufer » Mon Jun 26, 2017 11:16 am

Ann wrote:
What are the chances that there is liquid surface water on a planet inside its star's habitable zone?

Better than 50%? Worse than 50%?

George Bailey: What is it, a boy or a girl?

Mary: [nods enthusiasticly] Mmmm-hmmm!
Art Neuendorffer


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