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Question: Which is bigger, Earth or Venus?
Answer: The planets are almost the same size, Earth being very slightly larger.
Question: How many Earth days are in Venus’s year?
Answer: A Venutian year is 224.7 Earth days.
Question: What gas is most abundant in Venus’s atmosphere?
Answer: Venus’s atmosphere is 96% carbon dioxide.
Question: What was the first spacecraft to visit Venus?
Answer: Mariner 2 (launched August 27, 1962) flew by Venus and took measurements of its atmosphere.
Question: Who discovered that Venus has phases like the Moon’s?
Answer: Galileo discovered Venus’s phases in the early 17th century. This helped prove that the planets orbit the Sun and not Earth.
Question: How many moons does Venus have?
Answer: Venus, like Mercury, has no moons.
Question: True or false: A day in Venus is longer than a year.
Answer: Venus rotates very slowly. It circles the sun in 225 Earth days but takes 243 to rotate fully around its axis.
Question: True or false: Venus is the hottest planet in the solar system.
Answer: Although Mercury is closer to the Sun, Venus’s carbon dioxide-rich atmosphere creates a greenhouse effect that traps heat.
Ultraviolet image of Venus' clouds as seen by the Pioneer Venus orbiter; February 26, 1979.


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