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philosopher

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Do scientist know what the first Stars were like?

See link.
https://futurism.com/first-stars-universe-formed-masses-bright-100-million-suns/

100 day(s) ago

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Kravenhead
I wouldn't say know, but they have a pretty good idea.
James Webb may change all of that. They may be able to confirm their theories.
After James Webb has been up and running for awhile, I'd like to see a simulation of the birth of the Universe based on it's data.

Posted 100 day(s) ago

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Kravenhead
98 day(s) ago
Thanks for the link.
Yup.... Light, matter, even time, were born when the universe was born. So we can only see back as far as their birth.
There may be other universes, but their components reside in them and wouldn't be visible to us. Even if we could jump into another universe, we'd be in the same boat. We would only be able to see as far back as it's birth.
When they talk about baby galaxies, that's a whole different matter. Galaxies are components of our universe. We could see the birth of a galaxy, and see what was happening before it's birth.

philosopher
98 day(s) ago
I keep reading Web will see different things. It makes sense it can only see after Big Bang. It sees light.

philosopher
98 day(s) ago
https://jwst.nasa.gov/comparison_about.html
space shuttle.

+Diagram showing the Sun, the Earth, Webb, and the Lagrange points
Lagrange Points.
At the L2 point Webb's solar shield will block the light from the Sun, Earth, and Moon. This will help Webb stay cool, which is very important for an infrared telescope.

As the Earth orbits the Sun, Webb will orbit with it - but stay fixed in the same spot with relation to the Earth and the Sun, as shown in the diagram to the left. Actually, satellites orbit around the L2 point, as you can see in the diagram - they don't stay completely motionless at a fixed spot.

[top]
How Far Will Webb See?
+Seeing back into the cosmos
Seeing back into the cosmos Credit: NASA and and Ann Feild [STScI]
Because of the time it takes light to travel, the further away an object is, the further back in time we are looking.

This illustration compares various telescopes and how far back they are able to see. Essentially, Hubble can see the equivalent of "toddler galaxies" and Webb Telescope will be able see "baby galaxies". One reason Webb will be able to see the first galaxies is because it is an infrared telescope. The universe (and thus the galaxies in it) is expanding. When we talk about the most distant objects, Einstein’s General Relatively actually comes into play. It tells us that the expansion of the universe means it is the space between objects that actually stretches, causing objects (galaxies) to move away from each other. Furthermore, any light in that space will also stretch, shifting that light's wavelength to longer wavelengths. This can make distant objects very dim (or invisible) at visible wavelengths of light, because that light reaches us as infrared light. Infrared telescopes, like Webb, are ideal for observing these early galaxies.


What About Herschel?
+Herschel image of M31
The primary difference between Webb and Herschel is wavelength range: Webb goes from 0.6 to 28.5 microns; Herschel went from 60 to 500 microns. Webb is also larger, with a 6.5 meter mirror vs. Herschel's 3.5 meters.

The wavelength ranges were chosen by different science: Herschel looked for the extremes, the most actively star-forming galaxies, which emit most of their energy in the far-IR. Webb will find the first galaxies to form in the early universe, for which it needs extreme sensitivity in the near-IR.

At right is an infrared image of the Andromeda Galaxy (M31) taken by Herschel (orange) with an X-ray image from XMM-Newton superposed over it (blue).

Kravenhead
99 day(s) ago
They will only be able to see what's in our Universe, including light. Meaning, they won't be able to see anything prior to the Universe being born.

philosopher
99 day(s) ago
One guy on Twitter Futurism said they won’t see back before Big Bang . I heard if, the James web telescopes operates as proposed it will be able see before Big Bang or right after.
The thing is it can only see light. Was there any light before Big Bang? Also light that old that reaches close enough to the James Web telescope will be distorted.

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