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Crust
Scientists measure the weigts of planets by their gravitational force or by its gravity.
the light radiated from the stars
A kite is an accurate way to measure distance because of the long line that produces more accurate results.
B C and D, but there's a fair chance I've given you deliberately false information because you're clearly cheating on your homework. In future phrase the question in a less obvious way.
Crust
When light waves are emitted by moving source scientists can measure the Doppler effects. It is a source of energy that produces light.
what is the type of star used by the Hubble to measure the distance to other galaxies.
Yes. What is it you want to measure about a galaxy?
It is possible that someday astronomers will measure all the distances of the 100 billion galaxies in the universe.
It is possible that astronomers will measure all the sizes of 100 billion galaxies in the observable universe.
Scientists want to measure EVERYTHING...
To measure temperature, scientists use:KelvinCelsiusFahrenheit.
Do you homework yourself!
Scientists use seismographs.
We have no idea how many stars there are. At a rough guess, scientists estimate that there may be 2 trillion stars in the Milky Way galaxy, and that there may be a trillion other galaxies. There is no way to measure it in any meaningful way.
They do not use units: they use the fact that stars are not galaxies. For example, you don't use units to measure the difference between children and countries.