The Moon is about one-quarter the diameter of Earth. How does its mass compare?
A. The Moon is 1/81 as massive as Earth.
B. The Moon is 1/4 as massive as Earth.
C. The Moon is 1/6 as massive as Earth.
D. The Moon is 1/32 as massive as Earth.
Answer: A
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Gravitational Force: At their closest approach, Venus and Earth are 4.20 × 1010 m apart. The mass of Venus is 4.87 × 1024 kg, the mass of Earth is 5.97 × 1024 kg, and G = 6.67 × 10-11 N ? m2/kg2. What is the magnitude of the gravitational force exerted by Venus on Earth at that point?
A. 1.10 × 1018 N B. 4.62 × 1028 N C. 5.43 × 1026 N D. 6.30 × 1020 N E. 1.72 × 1019 N
Based on discoveries to date, which of the following conclusions is justified?
A) Planetary systems are common and planets similar in size to Earth are also common. B) Although planetary systems are common, few resemble ours with terrestrial planets near the Sun and jovian planets far from the Sun. C) Planets are common, but planets as small as Earth are extremely rare. D) Most stars have one or more terrestrial planets orbiting within their habitable zones.
Because Jupiter's four large moons were discovered by Galileo, they are called ______________ moons
Fill in the blank(s) with correct word
A star is observed with a surface temperature of 3000 K and a luminosity of 10?3 times that of the Sun. Based on the H-R diagram shown above, what is the approximate radius of this star?
A) 0.1 solar radius B) 0.5 solar radius C) 1 solar radius D) The radius cannot be determined.