![]() ![]() Locations around Earth's equator only receive about 12 hours of light each day. Why does Earth's day length change during the year?Įvery location on Earth experiences an average of 12 hours of light per day but the actual number of hours of daylight on any particular day of the year varies from place to place. ![]() ![]() Something to ponder: Does Pluto even have a “day” and “night” like we think of on Earth? Pluto is so distant from the center of our solar system that our Sun would look like a very bright star in its sky! Pluto, at the farthest reaches of our solar system, spins on its axis once every 6.4 days. ![]() Jupiter rotates once every 10 hours, Saturn spins once every 11 hours, and Neptune completes a rotation in 16 hours. Because of this, Mercury's day - from sunrise to sunrise - is 176 Earth days long. Mercury rotates one-and-a-half times during each orbit around the Sun. Mercury's day and night cycle is more complex. Venus turns once on its axis every 243 Earth days (which is only slightly longer than it takes for Venus to go around the Sun!). Mars rotates on its axis once every 24.6 hours. Mars has a day and night cycle similar to Earth. Some planets rotate faster than Earth and some rotate slower. There are differences, however, in the length of day and night - the cycles are made even more complex by the tilt of a planet's axis and its rate of orbit. Yes! All the planets in our solar system spin on their axes (so does our Sun!) and so they have day and night cycles. ![]()
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