Learning science Part 1 : Universe, solar system, earth by Indumati Rao;C.N.R. Rao

By Indumati Rao;C.N.R. Rao

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But Neptune is the windiest planet, with winds blowing upto 2,400 km per hour. The width of some of the storms is wider than the earth. Learning Science 47 How were the moons formed? The mental picture we get of the moon is the beautiful milky white object in the night sky. But moon actually is the satellite of a planet. Astronomers believe that after the main planets were formed, the remaining small bits came together and became moons. They became the satellite of the planets which held them by their gravitational attraction.

9 million kms) sun and Pluto is farthest from the sun (5,900 million kms) Pluto is a lonely planet. Its closest neighbour Neptune is nearly 1,414 million km from it. Mercury, Venus, Earth and Mars are relatively close to the sun. They are grouped together as terrestrial planets. Mercury Mercury is the closest planet to the sun. It is difficult to spot mercury in the night sky as it is very close to the sun. Mercury is a small planet. 055 (Earth = 1). Its surface temperature ranges from very cold to very hot (-1800C to 4300C).

40 Learning Science The eccentricity of the orbit of Pluto is the greatest. ) In the solar system, the orbits of comets are most eccentric. Density of planets The main difference between the gaseous giant planets and the inner planets is in their densities. Density of a substance tells us how tightly the matter in a body is packed. mass of the substance volume of the substance Density of water is taken as the standard to measure the density of a substance. ) The individual special characteristic of planets: a brief look Mercury - the planet that is hurtling around the sun.

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