Universe Expansion: How Fast Is It?

  • Thread starter Thread starter Chris_Gottschal
  • Start date Start date
  • Tags Tags
    Expansion Universe
AI Thread Summary
The universe is expanding at an estimated rate of approximately 70 kilometers per second per megaparsec. This expansion can also be expressed as a percentage, with a tenth of a percent increase taking about 14 million years and a one percent increase taking around 140 million years. Galaxies at increasing distances recede from us at speeds proportional to their distance, with those 14 billion light-years away receding at the speed of light (c), and those 28 billion light-years away receding at double that speed (2c). This discussion translates complex astronomical concepts into more relatable terms. Understanding the universe's expansion is crucial for comprehending cosmic dynamics.
Chris_Gottschal
Messages
4
Reaction score
0
How fast is the universe expanding. Even an estimate would be a good enough answer.
 
Astronomy news on Phys.org
chroot said:
Roughly 70 kilometers per second per megaparsec of distance.

http://en.wikipedia.org/wiki/Hubble_constant

- Warren

another way to visulize it is as a percentage expansion over time.

at the present rate of expansion it would take about 14 million years for it to expand by a tenth of a percent-----or 140 million years to expand by one percent.

this is equivalent to what Chroot said

another way to say the same thing is that a galaxy which is at this moment 14 billion LY from us is receding from us at speed c.

a galaxy which is currently 28 billion LY from us is receding at speed 2c, and so on.

something 42 billion LY away is presently receding at 3c...

(this is just translating Chroot's figure into different units which may be more familiar to some people)
 

Thread 'Potential biosignature found in Mars rock'

Publication: Redox-driven mineral and organic associations in Jezero Crater, Mars Article: NASA Says Mars Rover Discovered Potential Biosignature Last Year Press conference The ~100 authors don't find a good way this could have formed without life, but also can't rule it out. Now that they have shared their findings with the larger community someone else might find an explanation - or maybe it was actually made by life.
View full post »

Thread 'Does it make sense to build new radio telescopes?'

TL;DR Summary: In 3 years, the Square Kilometre Array (SKA) telescope (or rather, a system of telescopes) should be put into operation. In case of failure to detect alien signals, it will further expand the radius of the so-called silence (or rather, radio silence) of the Universe. Is there any sense in this or is blissful ignorance better? In 3 years, the Square Kilometre Array (SKA) telescope (or rather, a system of telescopes) should be put into operation. In case of failure to detect...
View full post »
Thread 'Could gamma-ray bursts have an intragalactic origin?'

Thread 'Could gamma-ray bursts have an intragalactic origin?'

This is indirectly evidenced by a map of the distribution of gamma-ray bursts in the night sky, made in the form of an elongated globe. And also the weakening of gamma radiation by the disk and the center of the Milky Way, which leads to anisotropy in the possibilities of observing gamma-ray bursts. My line of reasoning is as follows: 1. Gamma radiation should be absorbed to some extent by dust and other components of the interstellar medium. As a result, with an extragalactic origin, fewer...
View full post »

Similar threads

I How fast were distant galaxies moving?
Replies
7
Views
2K
I How can the Universe be infinite?
Replies
6
Views
2K
I Does the expansion of the Universe affect orbiting bodies?
2
Replies
82
Views
7K
B Is There a Reference Point for the Expansion of the Universe?
Replies
3
Views
2K
B Photon Decoupling: Effects on Universe Expansion
Replies
2
Views
2K
I Questions on Expansion of the Universe and Newtonian Physics
Replies
7
Views
1K
I Accelerating universe explained by constant expansion?
Replies
1
Views
1K
I How do gravitational waves differ from the expansion of the Universe?
Replies
12
Views
2K
B The accelerating expansion of the universe
Replies
3
Views
2K
I Infinity vs Expansion: Is an Infinite Universe Compatible with Expansion?
Replies
17
Views
2K

Hot Threads

Recent Insights

Back
Top