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Doppler shift tells the distance form the earth station
Mainly astronomers. But cosmologists and astrophysicists will also be interested in outer space.
Small objects that we can detect in space are all in the solar system and they all orbit the Sun and obey Kepler's laws of planetary motion, as do all the planets, asteroids etc.
As astronaut travels into outer space and some have been killed doing so. Most astronomers stay on the planet Earth and look up into space. There have been astronauts who are astronomers, but, most astronomers are not astronauts. There have been tens of millions of astronomers looking up at outer space, but, only a few hundred astronauts. No, they are not the same.
Astronomers
Astronomers.
Astronomers.
astronomers
space research centre
astronomers
A Telescope
Because the astronomers can detect that a star is being whirled around in space, or space is being distorted.
A radio telescope.
radar
By using the habo space telescle to detect the object's velocity
A radio telescope
Radio Telescope