Comets are composed of ______________
a. dust and ice
b. rock
c. helium
d. lead
e. iron
a
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Isaac Newton guessed that gravity works by an inverse square relation because he had already discovered that light behaves this way
Indicate whether the statement is true or false
Why does one cycle of lunar phases take 29.53 days even though the Moon orbits Earth in 27.32 days?
What will be an ideal response?
Which of the following is ordered correctly from largest to smallest planet?
a. Neptune, Saturn, Moon, Earth b. Venus, Mercury, Jupiter, Saturn c. Mars, Earth, Saturn, Jupiter d. Uranus, Saturn, Venus, Earth
If a star is located at 10 pc, which of the following statements is correct?
a. The star's apparent and absolute visual magnitudes are equal. b. The star's apparent and absolute visual magnitudes are 0. c. The star's apparent visual magnitude is –-1.1 whereas the absolute visual magnitude is –5 d. Two of the other choices are correct.