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Ask a Spaceman!

AaS! 229: Is the James Webb Breaking Cosmology?

Ask a Spaceman!

Paul M. Sutter

Astrophysics, Science, Cosmos, Holes, Black, Astronomy, Natural Sciences, Universe, Cosmology, Space, Physics

4.8853 Ratings

🗓️ 6 August 2024

⏱️ 36 minutes

🧾️ Download transcript

Summary

What has the James Webb Space Telescope learned so far? Is it finding galaxies that “break” cosmology? What will we learn next? I discuss these questions and more in today’s Ask a Spaceman!

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Hosted by Paul M. Sutter.

Transcript

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0:00.0

I'd like to introduce you to a little galaxy named Jades-G-S-G-14-0.

0:15.9

It is the most distant, known galaxy.

0:19.7

It's unlikely to hold its title for long as the James Webb

0:24.8

Space Telescope is designed to find even more distant galaxies, but for now it reigns supreme.

0:32.4

This galaxy, and we'll call it Jade for short, has a redshift of 14.32, hence the Z-14 in its full name.

0:42.4

And it existed when the universe was only 290 million years old.

0:47.8

That's a toddler compared to the present-day age of the universe of nearly 14 billion years.

0:56.2

Jade is small.

0:57.4

It's only about 1,600 light years across, but it's mighty.

1:01.0

It's exceptionally bright and full of stars.

1:04.1

In fact, it might be a little too bright and too full of stars.

1:09.1

And at 1,600 light years across, while not a lot by modern

1:13.6

present-day universe standards, at that early epoch, it's a veritable behemoth of a galaxy.

1:20.8

Jade is so young, so bright, and so large that some have openly wondered if it's even possible to explain the existence of

1:30.1

jade within our current understanding of the Big Bang.

1:34.0

So what's going on?

1:35.6

Are these galaxies breaking cosmology?

1:39.7

Or is there more to the story?

1:42.0

Well, if this is your first time encountering me or this show, then one I'm about to say

1:47.4

may come as a little bit of a surprise.

1:50.5

If you're a regular, first, welcome back.

1:52.7

And two, you know exactly what I'm going to say next.

...

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