Earth's atmosphere blocks many types of light including gamma, x-rays most ultraviolet and infrared. So optical telescopes that use visible light and ultraviolet telescopes that are used to study very hot stars are much less effective on Earth.
Answer:
mass.
Explanation:
other physical factors are changeable but the mass of a particular substance is always constant.
300N/25 kg= divide them for the answer
Answer:
diminished and erect( upright)
Explanation: