We are part of the milky way galaxy, so we are moving with it.
Relative to what? From the Milky Way Galaxy it is receding at about 203 km/s
299792.458 kilometres per second
300 km/s Edit: I've seen that estimate, but it's not straightforward. It's not like finding how fast the Earth orbits the Sun, for example. For one thing the largest galaxy, called Andromeda, is moving towards Earth.
The redshift tells scientists how fast a star or galaxy is moving away from us.
Compared to what reference point? A velocity of some object should always be indicated relative to some other object.
When calculating the velocity of the earth there are three major vectors to calculate. First, the velocity of the earth as it orbits the sun. Second, the velocity as the solar system rotates around the galaxy. Third, the velocity that the Milky Way galaxy is moving through the universe. The Earth moves at 30 km/sec around the sun. The sun moves at 250 km/sec around the Milky Way and finally, the Milky Way is moving at about 300 km/second.
It tells us whether a star (or galaxy, or other object) is moving towards us, or away from us; and how fast.
AnswerAt the equator the earth spins at 0.0005 Meters per second. Here's a bit more data -- you can do the math. ;-)•How fast is the Earth spinning? 0.5 km/sec•How fast is the Earth revolving around the Sun? 30 km/sec •How fast is the Solar System moving around the Milky Way Galaxy? 250 km/sec •How fast is our Milky Way Galaxy moving in the Local Group of galaxies? 300 km/secThe answer is incorrect. If you do the math, then the velocity would be 500m/sec..0005m/s equates to .0000005km/s.
because in Greek mythology Hera was tricked into nursing one of Zeus's kids and when she found out she pulled the kid away so fast that some extra milk poured out -- that is what they thought it looked like so then astronomers added way and galaxy
This completely depends on the speed of the observed galaxy, the speed of the galaxy the observer resides in, and in which direction both galaxies are moving in relation to each other. There are too many variables to provide an answer at this time.
Probably many objects will collide with our Milky Way. One that is fairly well-known is M31 (the Andromeda Galaxy), which seems to be heading directly towards us, and MIGHT collide with our galaxy in 2-3 billion years. However, it is not yet perfectly clear how fast it is moving "sideways", so it may actually miss our galaxy. On the other hand, collisions between galaxies are fairly common events.
The star's spectrum is analyzed; certain lines in the spectrum, which have a fixed position, will change their position when the object moves away from us or towards us.