Posted on 07/01/2017 7:01:15 PM PDT by ETL
This is just me asking, but if the universe were expanding wouldn’t the twelve Constellations get all out of whack instead of remaining at the very same configurations as they were 2 or 3 millennia ago?
It’s even simpler than that...Since there can not be nothing, there is always something and it may be dark if you can’t see or measure it. There is always something there.
The constellations do change over time. But not due to universal expansion, but rather because, like everything in the the universe, the stars are in motion. We can’t notice any changes during the course of our lifetimes, as it takes thousands of years to become noticeable.
No.
The stars in the constellations are in our galaxy, practically next door. And given time they will in fact move from their present positions and scramble the constellations. A couple thousand years is a link of the cosmic eye....
Universal expansion occurs on the grandest of scales. ie, even structures as enormous as galaxies, with hundreds of billions of stars contained in them, basically aren’t affected by cosmic expansion. Gravity wins out at even that scale and holds them together. UE takes place in the incomprehensibly large regions between galaxies.
The DNC is dark energy
Galaxies are mostly moving apart, except our huge neighbor Andromeda which is on a collision course with our Milky Way galaxy. The collision is about 3 billion years away.
The constellations we can see with our bare eyes are all nearby stars in the Milky Way and are orbiting the massive black hole in the center of the galaxy so they are moving along with us. The stars in the Milky Way are not moving apart, they are slowly being sucked into the black hole. Generally it is other galaxies that are moving away from us (except for Andromeda).
Certain Rap Performances have a lot of energy
#DarkEnergyMatters (except that it’s energy, so it can’t matter)
Aren’t they kind of figuring out that every galaxy has at least one black hole?
Oh yeah, a space thread: Klingons! Uranus!
We can’t actually “see” any stars, except our sun. What we see are point sources of photons emitted by other suns. If it weren’t for the emitted photons the stars would be undetectable.
If they were objects illuminated by reflected light only, we could never detect or resolve the very tiny angular diameters of suns hundreds or thousands of light years distant.
All this is to establish that while all stars are in motion, the distances involved are so staggeringly vast that it takes thousands of years for them to change relative positions in our sky to a detectable extent.
But matter and energy are manifestations of the same thing. One can be converted into the other, via Einstein's famous e=mc^2.
Someone outta shine on a light on dark energy.
I beat you by one billion nano-seconds!
He’s writing for a general audience. The statement isn’t supposed to be taken literally.
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