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Credit & Copyright: Wikipedia,
Pablo Carlos Budassi
Explanation:
How far can you see?
Everything you can see, and everything you could possibly see, right now, assuming
your eyes could detect all types of radiations around you -- is the
observable universe.
In light, the farthest we can see comes from the
cosmic microwave background, a time
13.8 billion years ago
when the universe was opaque like thick fog.
Some neutrinos and
gravitational waves
that surround us come from even farther out, but humanity does not yet have the technology
to detect them.
The featured image illustrates the observable universe on an
increasingly compact scale, with the
Earth and
Sun
at the center surrounded by
our Solar System,
nearby stars,
nearby galaxies,
distant galaxies,
filaments of early matter, and the
cosmic microwave background.
Cosmologists typically assume that our observable
universe is just the nearby part of a greater entity known as "the universe"
where the same physics applies.
However, there are several lines of popular but speculative reasoning that
assert that even our universe is part of a
greater multiverse where either
different physical constants occur,
different
physical laws apply,
higher
dimensions operate, or slightly
different-by-chance versions
of our standard universe exist.
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: universe
Publications with words: universe
See also:
- APOD: 2024 December 1 Á Cosmic Latte: The Average Color of the Universe
- APOD: 2024 October 20 Á Dark Matter in a Simulated Universe
- APOD: 2024 July 1 Á Time Spiral
- APOD: 2023 December 31 Á Illustris: A Simulation of the Universe
- APOD: 2023 July 5 Á A Map of the Observable Universe
- APOD: 2023 June 29 Á A Message from the Gravitational Universe
- APOD: 2023 June 4 Á Color the Universe