We can never observe free-fall in our daily life on Earth. There's always at least one other force besides gravity acting on a falling body, because it's always falling through air.
6. found in the upper right of the H-R diagram -- A
7. a very hot and very luminous star --- B
Explanation:
The red giant is a luminous star with a mass in the late period of its stellar evolution and as the outer atmosphere inflated and is tenuous and maks the radius much larger and the temperature up to the 5000k.
While the main sequence is the continuous and a distinctive and is a continuous band of the stars appears in the stellar colors and the brightness. The majority of the stars in the galaxy are formed by these stars and the sun is an example.
While the white dwarf is degenerated and is composed of the hot and the dim stars these have a high density and mass.
