posted on Apr, 1 2013 @ 04:35 AM
Originally posted by AllIsOne
I.e. Hipparcos 5926 in Cassiopeia is 16,308 light-years away. One light year is 9.4607 × 10*12 km. How come we can see that star without any major
flickering? Seeing a star means that the light traveled an almost unimaginable distance without being absorbed, or blocked along the way. I feel the
photons should have hit something along the way, i.e. planets, gasses, suns, space debris, etc.. The universe is full of moving objects. Yet, we see
that star continuously shinning at night?
Many stars we cannot see because of the interstellar gas and dust. Those stars require infrared telescopes to see. Lots of other stars are visible,
but very dim and reddish because of the dust. The few stars that we can see clearly just happen not to be obscured, that's all. Why would they be
flickering? It's not like there's a crowd of gigantic objects constantly moving around like cars or people in a city. Space is very empty, things in
it move very slowly, and at such enormous distances their size is basically a point to us.
Asteroids and other objects in the Solar System block a star's light fairly often, but that is predicted in advance, and most of the stars require a
telescope. But even our busy Solar System is big enough and empty enough that we don't see stars being blocked all the time, and can send a space
probe without worrying it will bump into something. www.asteroidoccultation.com...
planets, gasses, suns, space debris, etc
~ Planets outside of the Solar System are so small we can't see them (with only a couple of exceptions that used the most powerful telescopes and lots
of optical processing). When such a planet gets infront of its parent star, the star's light is decreased by a very tiny bit, which requires an
instrument to detect and measure. Planets are usually in a system with their parent star (like planets in the Solar System are orbiting close to the
Sun), so I can't imagine lots of random planets just hanging around in the space between us and the star we're looking at.
~ Gasses in space are very rarefied, they're are a better vacuum than we can create in vacuum chambers here on Earth. It's usually the interstellar
dust that blocks the stars, but dust is usually gathered in blobs and is concentrated in the galactic plane, so it blocks certain stars, but doesn't
block the others. If you've read about our galaxy the Milky Way you would know that we cannot see the galactic core because of all the dust (unless we
use infrared telescopes).
~ I have never heard of a star blocking another star. While this might be possible in theory, space is just too big and distances between stars so
great that there is enough room for everyone
~ I'm not sure what you mean by space debris, but regardless, at such huge distances, debris of any kind is so small we can disregard it.
on 1-4-2013 by wildespace because: (no reason given)