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The Daily Cosmos or Interesting Facts about the Universe

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The Daily Cosmos or Interesting Facts about the Universe

Cosmology
Astrophysics
Astronomy

Location: #science
Members: 63
Latest Activity: Sep 22

 

Cosmology - Astrophysics - Astronomy

 

Hubble Wallpaper - Awesome Hubble Images

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Comment was by Chris B on September 22, 2022 at 1:41am

Interesting!

Comment was by Doone on September 13, 2022 at 4:20pm

Like other stars, the sun is a big gas ball made up mostly of hydrogen and helium. The sun generates energy in its core in a process called nuclear fusion. During nuclear fusion, the sun's extremely high pressure and hot temperature cause hydrogen atoms to come apart and their nuclei (the central cores of the atoms) to fuse or combine. Four hydrogen nuclei fuse to become one helium atom. But the helium atom weighs less than the four nuclei that combined to form it. Some matter is lost during nuclear fusion. The lost matter is emitted into space as radiant energy.

Comment was by Doone on September 4, 2022 at 7:21am

Surprisingly, our solar system might acquire new planets and even a new Earth in more than 5 billion years from now, after the red giant phase and the end of the main sequence of our Sun.

  • In about 4.5 billion years, our Sun will run out of all its hydrogen for nuclear fusion. It will swell and become the red giant star. It will engulf and destroy Mercury, Venus and maybe even the Earth if our future, still existing descendants don't move it to a more distant orbit.
  • In its red giant phase, our enlarged, colossal Sun will warm up previously frozen moons of Jupiter and Saturn for 170 to 300 million years. They have subsurface, locked-in-ice oceans that will become liquid but will only last a few hundred thousand years because they are too small and their gravity is too weak to hold on to them for long.
  • After that, our Sun will shed its outer layers, which gave it this humungous size and leave behind a helium-rich white dwarf star that will not fuse elements anymore; it will only shine with the stored thermal energy for a few billion years. If the Earth still exists, moved to further orbits, it will have to be moved back closer to this tiny white dwarf Sun or freeze over. The habitable zone of such small stars is very tight.
  • The shed matter will first be a ball surrounding our tiny now Sun. Still, eventually, as it starts infalling into the white dwarf, it might form a protoplanetary disk that will obscure the light unless the Earth is moved to an orbit that will not be in the same plane as other planets, at least for the time of the planetary formation. It will then have a direct, beautiful view of the disk.
  • It will be a sight to behold, as our sky will also fill up with an immense amount of comets. By then, our descendants will hopefully have a technology to shield our planet from the bombardment with them.
  • After a few million years, new planets might form. At first, the system might not be stable after acquiring them and for some time, there will be a chance that some worlds might dramatically change orbits, collide, fall into the Sun and be destroyed or some might be ejected and become rogue planets.

It's not very likely that our species or even our descendants will survive for eons to witness and experience the end of the main sequence of our Sun and see the possible second round of planetary formation. Still, if they do, there will be a non-zero chance that one of the new planets might be similar to our world. Maybe, with future technologies, we might even be able to influence the process of planetary formation and get the new Earth we want.

The question was: Will there be a new Earth after this?

Comment was by Doone on September 4, 2022 at 7:20am

From Quora some interesting facts about the far future of the solar system

https://www.quora.com/Will-there-be-a-new-Earth-after-this

Comment was by Mrs.B on May 16, 2022 at 12:59am

Yes, on our news.

Comment was by Stephen Brodie on May 15, 2022 at 5:24pm

Our Galaxy Has a Black Heart - And Now We Have An Image To Prove It!

Comment was by Stephen Brodie on April 23, 2022 at 3:10pm

That's exactly what I thought Chris spud eclipse 

Comment was by Chris B on April 23, 2022 at 1:53am

! Special eclipse by a potato!

Comment was by Mrs.B on April 23, 2022 at 1:05am

On our news last night.

Comment was by Stephen Brodie on April 23, 2022 at 1:03am

NASA's Perseverance Rover Sees Solar Eclipse on Mars

NASA’s Perseverance Mars rover used its Mastcam-Z camera system to shoot video of Phobos, one of Mars’ two moons, eclipsing the Sun. It’s the most zoomed-in, highest frame-rate observation of a Phobos solar eclipse ever taken from the Martian surface.
 
 
 

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