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Shares What causes the phases of the Moon?: Einstein 2010-4-3 11:34; The phases of the Moon occure because we only see half the Moon at any given time. Due to the constantly changing relative position of Sun, Earth, and Moon, this visible half is not always the hemisphere that the Sun illuminates. When the Moon is on the opposite side of Earth from the Sun, we on ...; 1268 views|2 replies

Shares What is the difference between the geocentric and heliocentric theories?: Einstein 2010-4-3 11:29; The geocentric tehory(believed by early astronomers) posits that a stable, motionless Earth is at the center of the universe. The heliocentric theory posits that the SUn is the center of the universe, and that everything else revolves around it. Today, astronomers recognize that the Sun is the ...; 487 views|0 replies

Shares What is the difference between a meteoroid, a meteor, and a meteorite?: Einstein 2010-4-3 11:23; A meteoriod is a small celestial body larger that an atom, but smaller than an asteroid. Asteroids range in size from a fraction of a mile to nealy 500 miles in diameter. Meteoroids orbit the Sun and may fall to any one of the planets in our solar system. A meteor is meteoriod entering Earth's ...; 552 views|1 replies

Shares What is the Sun made of?: Einstein 2010-4-3 11:07; The Sun is a ball of gasses, primarily hydrogen and helium, with smaller amounts of oxygen, carbon, iron, neon, nitrogen, silicon, magnesium, sulfur, and other elements. The Sun has a mass 333,000 times that of Earth, and a radius of just over 400,000 miles. It is heated by nuclear fusion and has a ...; 492 views|0 replies

Shares What is a white dwarf?: Einstein 2010-4-3 11:01; The remnant core of a start that has completed fusion in its core, a white dwarf is a white star of low luminosity, high surface temperature, small size, and great density. White dwarfs no longer shine due to nuclear fusion, and have collapsed to Earth-sized objects. Ironically, their surface tempe ...; 334 views|0 replies

Shares What are cosmic rays?: Einstein 2010-4-1 22:30; Cosmic rays are streams of atomic nuclei and other particles traveling through space at nealy the speed of light. They smash into the nuclei of atoms of atmospheric gas high above Earth. A significant portion of the energy in these nuclear streams is converted to matter in the form of subatomic par ...; 414 views|2 replies

Shares What are luxons, muons, and tachyons, and what is the difference between them?: Einstein 2010-4-1 22:24; All three are elemetary particles. A luxon is particle that travels at the speed of light (186,000 miles per second) in a vacuum and has a resting mass of zero. Though massless, luxons do carry momentum. Photons are an example of luxons. A muon is a short-lived subatomic particle. Muons are c ...; 656 views|0 replies

Shares What is a nova?: Einstein 2010-4-1 22:15; A nova is a star whose light may increase by a factor of ten thousand or more in a few days, then slowly fade. Novas are thought to occur when gases from the larger member of a binary star(two stars in orbit around a common center of mass) fall onto the smaller member, setting off a nuclear explosi ...; 291 views|0 replies

Shares What is the invers-square law?: Einstein 2010-4-1 10:53; The inverse-square law states that a reduction in the intensity of a physical quantity such as graivty or illumination is in proportion to the square of the distance from its source. For example, a planet at three times Earth's distance from the Sun would experience one-ninth the gravitational ...; 503 views|0 replies

Shares What is a pulsar?: Einstein 2010-4-1 10:47; A pulsar is a celestial body that emits radiation pulses of very shourt duration (one to a few thousands of a second) at highly regular intervals (from a fraction of a second to ten seconds). Pulsars are thought to be rotating neutron stars, which are highly dense stars generated from certain su ...; 295 views|2 replies

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