It MUST be either glue or gravity.
Electromagnetic waves do not require a medium to travel through. They can travel through empty space or matter.
Answer:
1: surface temperature
2: red giant
3: The brightest stars are called supergiants. Star clusters are rich in stars just off the main sequence called red giants. Main sequence stars are called dwarfs.
4: A white dwarf is very dense
5: red giant
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If the length and linear density are constant, the frequency is directly proportional to the square root of the tension.
Kinetic energy than parked