Explain the four internal processes that gradually destroy a solar nebula
What will be an ideal response?
1 . radiation pressure: low-mass specks of dust and individual atoms and molecules were pushed outward and eventually driven from the system
2 . solar wind: strong surging wind from the young Sun may have helped push dust and gas out of the nebula
3 . sweeping up of space debris by the planets: All of the old, solid surfaces in the Solar System are heavily cratered by meteorite impacts during the period of heavy bombardment 4 billion years ago
4 . ejection of material from the Solar System by close encounters with planets: If a small object such as a planetesimal passes close to a planet, the small object's path will be affected by the planet's gravitational field. In some cases, the small object can gain energy from the planet's motion and be thrown out of the Solar System. Ejection is most probable in encounters with massive planets, so the Jovian planets were probably very efficient at ejecting the icy planetesimals that formed in their region of the nebula.
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What is a meteorite?
A. any one of the large, rocky bodies that orbit the Sun, primarily between Jupiter and Saturn B. the object that causes a "shooting star," but before it passes through the atmosphere C. a space rock that survives its fall through Earth's atmosphere and reaches the ground D. a glowing trail of hot gas and debris heated by friction as an object moves through the atmosphere
Death Valley in California receives many German tourists. When you convert a summer temperature reading of 130°F to the Celsius scale they use at home, you find that the Celsius temperature is about
a. 26°C. b. 54°C. c. 72°C. d. 176°C e. 327°C.
HDTV is now being introduced in the U.S. It is likely that sales of HDTVs will follow an exponential growth curve during the earliest years of sales
What will be an ideal response?
Suppose you have a time-keeping device that always reads precisely 12:00 when the Sun crosses your meridian. What kind of time is this clock keeping?
A) apparent solar time B) mean solar time C) standard time D) universal time