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Extra resources for New Views of the Solar System

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This seems to happen at intervals ranging from tens of thousands of years to millions of years. The magnetic field dominates a large teardropshaped area around Earth. The region of space dominated by a planet’s magnetic field is known as its magnetosphere. Earth’s magnetosphere is shaped by interactions with the solar wind, or streams of electrically charged particles coming from the sun. The magnetic field holds off the solar wind about 40,000 miles (65,000 kilometers) above the planet. This collision creates a shockwave that deflects the solar particles around and past Earth.

The core extends outward from the center to a radius of nearly 2,200 miles (3,500 kilometers). It is probably composed mostly of iron, with some nickel and other elements. The outer core is liquid, while the smaller inner core is solid. Seismic evidence suggests that the inner core rotates a bit faster than the rest of the planet. Temperatures at the very center of Earth are thought to reach some 8,500 to 12,100° F (4,700 to 6,700° C), which is about as hot as the surface of the sun. Plate tectonics.

8 kilometers/second). 3 Earth days. 9 Earth hours. Day on Earth (Solar Day). 1 Earth hours. Tilt (Inclination of Equator Relative to Orbital Plane). 5°. Atmospheric Composition. 93% argon; variable amounts of water vapor, carbon dioxide, ozone, and other gases; small amounts of neon, helium, methane, krypton, and other gases. General Composition. Iron core, silicate rocks. Average Surface Temperature. 59° F (15° C). Number of Known Moons. 1. *Sidereal revolution period, or the time it takes the planet to revolve around the sun once, relative to the fixed (distant) stars.

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