Astronomy Picture of Day: Mercury Transits Sun# Astronomy - 天文
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Mercury Transits the Sun
Credit & Copyright: Thierry Legault
Explanation: How big is the Sun? The Sun is not only larger than any planet, it is larger than
all of the planets put together. The Sun accounts for about 99.9 percent of all the mass in its
Solar System. Merely stating the Sun's diameter is about 1,400,000 kilometers does not do it
justice. Last week a chance to gain visual size perspective occurred when planet Mercury
made a rare crossing in front to Sun. Mercury,
Credit & Copyright: Thierry Legault
Explanation: How big is the Sun? The Sun is not only larger than any planet, it is larger than
all of the planets put together. The Sun accounts for about 99.9 percent of all the mass in its
Solar System. Merely stating the Sun's diameter is about 1,400,000 kilometers does not do it
justice. Last week a chance to gain visual size perspective occurred when planet Mercury
made a rare crossing in front to Sun. Mercury,