Read e-book online Earth and the Moon (Space!) PDF

By Terry Allan Hicks

ISBN-10: 0761442545

ISBN-13: 9780761442547

ISBN-10: 0761445633

ISBN-13: 9780761445630

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Light-year—The distance that light travels in one year. lunar—Having to do with the Moon. lunar cycle—The changing appearance of the Moon over the course of a month. lunar eclipse—A brief period when Earth comes between the Sun and the Moon, causing the planet to throw a shadow on the Moon. magnetosphere—An area of magnetic force around a celestial object. maria—Flat, dark areas on the Moon’s surface. 59 earth and the moon mass—The amount of matter an object contains. matter—The substance of which something is made.

On the far, or dark, side of the Moon, the crust is about 60 miles (97 km) deep. Despite all the knowledge we have gained about the Moon, we still do not really know the reason for these differences. The main features of the lunar surface are the maria, the highlands, and the many impact craters. Forces both from outside and inside have left other marks on the Moon. 9 miles (3 km) in height. 8 km) in height. 8 km) above the surface. The temperature on the Moon’s surface varies much more widely than Earth’s.

This illustration shows that the seasons come about because Earth spins on its axis as it orbits the Sun. 42 a Closer LOOK aT Earth and the MOON Solstices and Equinoxes Twice a year, direct sunlight strikes the Earth at its farthest north and south points. These days are called the solstices. The summer solstice comes on June 20 or 21, when the Northern Hemisphere is tilted closest to the Sun. This gives the northern part of the planet its longest period of daylight and marks the beginning of summer.

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Earth and the Moon (Space!) by Terry Allan Hicks

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