New answers tagged galaxy
4
votes
how to make postage stamps of galaxies
Let me see if I can provide a general, conceptual outline of what's going on in making an (individual) postage-stamp image.
Decide what input astronomical images you will use. Since the input images ...
- 16.4k
2
votes
How fast is Andromeda approaching in miles per hour
About 670,000 miles per hour
Thanks to blueshifting, we have been able to pin the velocity of the Andromeda Galaxy at about 300 kilometers per SECOND, which when converted, yields a approximate value ...
- 2,585
5
votes
Accepted
Spiral Galaxies
You're right that a central mass can't explain the spiral structure (and you're also right about the tangent motion in case the string breaks). Spiral structure is indeed partially caused by gravity, ...
- 37k
0
votes
Spiral Galaxies
TLDR; Differential Rotation
Part 1: Accretion disk
Now of course, I am not stating forth that spiral galaxies are the accretion disks of their supermassive black holes.
But their proto-galaxies were.
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