A New Earth? What do you think.

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Profile Ernst
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Message 2005770 - Posted: 4 Aug 2019, 22:25:05 UTC

From cbsnews.com

"The planet named GJ 357 d, is six times larger than Earth. It orbits a dwarf star with two other previously unknown planets.

This potential "super Earth" is located within the outer edge of its star's habitable zone, where it receives about the same amount of stellar energy as Mars does from the sun. If this planet has a dense atmosphere, it could trap enough heat to allow for liquid water on its surface. "

First off it is said to be 31 light years away but is is six times larger then Earth.

Would that be 6G to us where 1G is our gravity. Man oh Man that is heavy .
ᴡᴇ ᴅᴀʀᴇsᴀʏ ᴀʙᴏᴜᴛ ᴛʜᴇ ᴘᴀsᴛ ᴛʜᴀᴛ ɪᴛ ɪs ғɪɴɪᴛᴇ ʏᴇᴛ ᴡᴇ ᴅᴀʀᴇ ɴᴏᴛ ʙᴇʟɪᴇᴠᴇ ᴛʜᴇ ғᴜᴛᴜʀᴇ ɪs.
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Profile Andy Helliwell
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Message 2005783 - Posted: 5 Aug 2019, 0:03:55 UTC - in response to Message 2005770.  
Last modified: 5 Aug 2019, 0:09:10 UTC

Oh only 31 light years away, we should leave right now, maybe we can be there for christmas.Heavy gravity though , I thought of that straigt away when I read how big the planet is.

They found quite a few of these sort of planets in recent years...I always loved astronomy.
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Profile Ernst
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Message 2005799 - Posted: 5 Aug 2019, 1:45:06 UTC - in response to Message 2005783.  

It's cool to be alive when we are finding planets.
I'm guessing it would take a "Generational" ship to get there.
ᴡᴇ ᴅᴀʀᴇsᴀʏ ᴀʙᴏᴜᴛ ᴛʜᴇ ᴘᴀsᴛ ᴛʜᴀᴛ ɪᴛ ɪs ғɪɴɪᴛᴇ ʏᴇᴛ ᴡᴇ ᴅᴀʀᴇ ɴᴏᴛ ʙᴇʟɪᴇᴠᴇ ᴛʜᴇ ғᴜᴛᴜʀᴇ ɪs.
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Profile Andy Helliwell
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Message 2005830 - Posted: 5 Aug 2019, 10:07:04 UTC - in response to Message 2005799.  

We need much faster methods of propultion, out chemical rockets are just too slow.

I like the xray telescope that they recently launched too, gives us another angle of vision to find things in space . I find this all very exiting.
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Message 2005843 - Posted: 5 Aug 2019, 11:49:45 UTC - in response to Message 2005830.  

I am under the impression we will be able to determine the atmosphere once James Webb Telescope is up there.
It will be so cool to find an oxygen rich atmosphere. That, I understand is strong evidence of life.
If there is plant life then tree trunks must be seriously massive. Any "animal life" would be very strong compared to Earth's animals since it is like 6G.
If I was on that planet I would be flat on the ground trying to lift my head up even a little. Funny thought!
Hey tho, I think I read "Super Earths" are common. Do you remember reading that?
ᴡᴇ ᴅᴀʀᴇsᴀʏ ᴀʙᴏᴜᴛ ᴛʜᴇ ᴘᴀsᴛ ᴛʜᴀᴛ ɪᴛ ɪs ғɪɴɪᴛᴇ ʏᴇᴛ ᴡᴇ ᴅᴀʀᴇ ɴᴏᴛ ʙᴇʟɪᴇᴠᴇ ᴛʜᴇ ғᴜᴛᴜʀᴇ ɪs.
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Profile William Rothamel
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Message 2005851 - Posted: 5 Aug 2019, 12:49:50 UTC - in response to Message 2005843.  

Super Earths are somewhat "common" because they are big enough to be "seen" as they transit their star.
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Message 2005871 - Posted: 5 Aug 2019, 15:31:09 UTC

A planet with six times the mass of Earth need not have six times the surface gravity. That would only be the case if the planet had the same diameter as Earth, which seems improbable. Given a larger diameter, the surface gravity falls off quickly, due to its greater distance from the center of mass. We know the mass of this newly discovered planet, but not its size. Hence, we can not yet know its surface gravity. There are reasonable scenarios where the surface gravity could be only twice that of Earth.
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Profile Bob DeWoody
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Message 2005900 - Posted: 5 Aug 2019, 20:29:26 UTC - in response to Message 2005871.  

A planet with six times the mass of Earth need not have six times the surface gravity. That would only be the case if the planet had the same diameter as Earth, which seems improbable. Given a larger diameter, the surface gravity falls off quickly, due to its greater distance from the center of mass. We know the mass of this newly discovered planet, but not its size. Hence, we can not yet know its surface gravity. There are reasonable scenarios where the surface gravity could be only twice that of Earth.

That's what I was going to say. +1
Bob DeWoody

My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events.
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moomin
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Message 2005904 - Posted: 5 Aug 2019, 20:53:18 UTC - in response to Message 2005871.  
Last modified: 5 Aug 2019, 21:01:08 UTC

I have read that the gravity is calculated to 2.7G on GJ 357 d surface if the planet has about 1.5 times the radius of the Earth..
https://www.science20.com/hontas_farmer/gj_357d_answer_super_earth_or_sub_neptune_then_report_about_life_chances-240272
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Profile Ernst
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Message 2006105 - Posted: 7 Aug 2019, 4:06:09 UTC

Well, The Gravity and the atmosphere. We shall see.
It is an exciting time to be alive.
ᴡᴇ ᴅᴀʀᴇsᴀʏ ᴀʙᴏᴜᴛ ᴛʜᴇ ᴘᴀsᴛ ᴛʜᴀᴛ ɪᴛ ɪs ғɪɴɪᴛᴇ ʏᴇᴛ ᴡᴇ ᴅᴀʀᴇ ɴᴏᴛ ʙᴇʟɪᴇᴠᴇ ᴛʜᴇ ғᴜᴛᴜʀᴇ ɪs.
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Profile Bob DeWoody
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Message 2006190 - Posted: 7 Aug 2019, 18:41:49 UTC

Call me if they find an "earthlike" planet circling a star less than 10 LY from us. And even then it would take a means of propulsion way beyond what we can do to get there in less than a lifetime. Unless or until some genius invents some sort of interstellar power plant we are stuck within the confines of our own star system so we better start taking better care of mother earth as it will end up a lot cheaper than making some other rock, even one circling our own star, habitable.
Bob DeWoody

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Profile William Rothamel
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Message 2006309 - Posted: 8 Aug 2019, 12:52:17 UTC - in response to Message 2006190.  

You are right on Bob
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Profile Ernst
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Message 2008094 - Posted: 18 Aug 2019, 17:31:46 UTC

Somewhere someone is playing the song "The Impossible Dream."

"This is my quest, to follow that star
No matter how hopeless, no matter how far ...."

Love YA Frank!
youtube.com/watch?v=JjI7VeIA7ZI

:)
ᴡᴇ ᴅᴀʀᴇsᴀʏ ᴀʙᴏᴜᴛ ᴛʜᴇ ᴘᴀsᴛ ᴛʜᴀᴛ ɪᴛ ɪs ғɪɴɪᴛᴇ ʏᴇᴛ ᴡᴇ ᴅᴀʀᴇ ɴᴏᴛ ʙᴇʟɪᴇᴠᴇ ᴛʜᴇ ғᴜᴛᴜʀᴇ ɪs.
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moomin
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Message 2008105 - Posted: 18 Aug 2019, 18:10:21 UTC - in response to Message 2008094.  

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Message boards : SETI@home Science : A New Earth? What do you think.


 
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