66,000MPH or 107,200 KM/HR
Mars
Mars
Copernicus.
Jupiter
He discovered that the Earth is a moving planet
Gravity.
nothing, as far as I know. The earth isn't moving slow, it's moving extremely fast.
No planet is made of glass, as far as I know. The giant planets - Jupiter, Saturn, Uranus, Neptune - are large, and made mostly of gas. However, they are not fast-moving.The inner planets - Mercury, Venus, Earth, Mars - are slow, fast-moving, and made basically of rock.
It changes every day
A planet isn't retrograde - retrograde means the direction a planet moves in relation to how we see it here on Earth or other perspectives. Planets sometimes appear to move backward due to Earth moving as well.
Yes, the earth rotates but too fast for us to notice.
10km/s