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This touching story of a father and child's nighttime excursion to watch a meteor shower is told through the eyes of a child in awe of the night world. Rockliff's vivid descriptions make readers feel as though they too are watching the tiny bits of other, distant worlds blazing into our own.The "For Creative Minds" education section includes teaching trivia about meteors, meteor showers, comets, and asteroids as well as a "Meteor Math" game, a "Five...
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This touching story of a father and child's nighttime excursion to watch a meteor shower is told through the eyes of a child in awe of the night world. Rockliff's vivid descriptions make readers feel as though they too are watching the tiny bits of other, distant worlds blazing into our own.The "For Creative Minds" education section includes teaching trivia about meteors, meteor showers, comets, and asteroids as well as a "Meteor Math" game, a "Five...
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Español
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Ahora sí que yo estaba todo despierto. "¿Salir? ¿Salir adónde?" pero él se había ido. Ven junto con Jody y su padre a una excursión mágica y misteriosa al mundo nocturno-y del más allá. Con una prosa simple pero lírica e ilustraciones evocativas en acuarela, esta acogedora historia familiar trae a la vida la alegría y el asombro de un niño al ver su primera lluvia de meteoritos. La perfecta compenetración de la naturaleza, la ciencia...
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A voyage to another star would require exact information on distances and properties of the stars. This lecture shows how astronomers measure the distance to nearby stars and how they determine their surface temperatures, which are the basis for stellar classification.
8) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: Jupiter and Its Amazing Moons
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Beyond Mars lie the four gas giants: Jupiter, Saturn, Uranus, and Neptune. Jupiter is the Solar System's largest planet by far. Its moons include Io, which is volcanically active, and Europa, which may have an ocean of liquid water below its frozen surface.
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According to general relativity, the fate of the Universe is tied to its global geometry. If the Universe has positive curvature, like a sphere, it must eventually collapse in a "Big Crunch." If it is flat or has negative curvature, however, it will expand forever.
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If a quantum fluctuation gave rise to our Universe, must ours be the only one? Are others possible, perhaps even with different rules? This lecture examines reasons for suspecting the existence of other universes, though we do not know how to test for their presence.
11) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: Dark Energy-Quintessence?
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This lecture looks at problems with the quantum fluctuations explanation for dark energy. One alternative is called quintessence-a class of models that postulate repulsive energy that may be associated with unified forces or fields.
16) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: The Afterglow of the Big Bang
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An accidental discovery in 1965 overturned the steady-state theory of the Universe, an alternative to the Big Bang theory. The detection of a uniform microwave glow in all directions was exactly what was expected if the Universe was hot and dense long ago.
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Brown dwarfs are low-mass objects whose dim glow is caused by slow gravitational contraction and the fusion of deuterium, a heavier but far less abundant isotope of hydrogen. Free-floating planets have even less mass than brown dwarfs and are not associated with any star.
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The dark energy that is causing the expansion of the Universe to accelerate makes up about 75 percent of the cosmos. Visible matter accounts for less than 1 percent. The bulk of the remainder is dark matter, most of which may consist of exotic subatomic particles.
19) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: On the Shoulders of Giants
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According to legend, Newton saw a falling apple and realized that the force that pulled it toward Earth also pulled on the Moon, keeping it in its orbit. Building on the work of Kepler and Galileo, he revolutionized astronomy with his law of universal gravitation and laws of motion.
20) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: Einstein's Biggest Blunder?
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The unexpected finding that the Universe is expanding at an ever-faster rate lends support for the existence of a non-zero cosmological constant, a formerly discredited idea of Einstein's, which he once called his "biggest blunder."
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