▪The tallest mountain on any of the planets of our solar system is Olympus Mons. It is on the Mars. It is 25 km high which is nearly three times the height of Mount Everest.

▪Density of Saturn is less than the density of water. If we put Saturn in water it would float.

▪One day of Venus is bigger than its one year because its rate of rotation is much smaller than its rate of revolution. It takes 243 days to rotate on its axis while it takes 224.7 days for one revolution. By the way it is the slowest rotating planet of our solar system.

▪Mercury and Venus have no moon while Jupiter has 79 moons.

▪Venus is the brightest planet in our solar system. It is visible before sunrise and after sunset.

▪Mercury is the closest planet to the Sun but it is not the hottest planet. It has no atmosphere so the heat quickly escape out into space. Venus is the hottest planet because it has a thick atmosphere of carbon dioxide which trap the heat and does not allow heat to escape back into space.

▪Jupiter is the fastest rotating planet in our solar system. It takes nearly 10 hours to make a complete rotation. Hence it has the shortest day.

▪Mercury has the highest speed of revolution around the Sun. It takes only 88 days to complete one revolution.

▪Neptune has the slowest speed of revolution. It is the last planet and the distance from the Sun is the longest. It takes approximately 165 years to complete a revolution around the Sun.

▪Sun is the nearest star. It revolves around our galaxy, Milky way in 230 million years.

▪Our Earth is extremely tiny in comparison with our Sun. Nearly 1.3 million Earths can be accommodated inside the Sun.

▪Earth would become a black hole if it compressed itself below 9 mm. This is the Earth's schwarzschild radius.

▪The real image of Earth was taken by the crew of Apollo 17 in 1972. This famous image is known as Blue Marble and this is the only real photograph of Earth available to us.

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