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Lecture7 - UCSB Physics
Lecture7 - UCSB Physics

... • The formation of terrestrial planets around a star is thought to have occurred by what process? •  A) Breakup of a large disk of matter which formed around the star •  B) Condensation of gas from the original star nebula •  C) Capture by the star of objects traversing the depths of space •  D) Acc ...
Describing the Solar System File
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... that of mars and Jupiter are thousands of asteroids.  Asteroids could be the remains of a smashed up planet or moon.  Asteroids are lumps of rock ranging from a tennis ball in size up to 700km across.  It is thought that Jupiter’s gravity keeps the asteroids smeared out around this belt and stops ...
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2001: A Space Odyssey - Streetsboro City Schools
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Inner and Outer Planets
Inner and Outer Planets

... core. This energy is released from the sun in the form of heat and light. • Remember: Stars produce light. Planets reflect light. • A star’s temperature determines its “color.” The coldest stars are red. The hottest stars are blue. ...
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Panspermia



Panspermia (from Greek πᾶν (pan), meaning ""all"", and σπέρμα (sperma), meaning ""seed"") is the hypothesis that life exists throughout the Universe, distributed by meteoroids, asteroids, comets, planetoids and, also, by spacecraft in the form of unintended contamination by microorganisms.Panspermia is a hypothesis proposing that microscopic life forms that can survive the effects of space, such as extremophiles, become trapped in debris that is ejected into space after collisions between planets and small Solar System bodies that harbor life. Some organisms may travel dormant for an extended amount of time before colliding randomly with other planets or intermingling with protoplanetary disks. If met with ideal conditions on a new planet's surfaces, the organisms become active and the process of evolution begins. Panspermia is not meant to address how life began, just the method that may cause its distribution in the Universe.Pseudo-panspermia (sometimes called ""soft panspermia"" or ""molecular panspermia"") argues that the pre-biotic organic building blocks of life originated in space and were incorporated in the solar nebula from which the planets condensed and were further —and continuously— distributed to planetary surfaces where life then emerged (abiogenesis). From the early 1970s it was becoming evident that interstellar dust consisted of a large component of organic molecules. Interstellar molecules are formed by chemical reactions within very sparse interstellar or circumstellar clouds of dust and gas. The dust plays a critical role of shielding the molecules from the ionizing effect of ultraviolet radiation emitted by stars.Several simulations in laboratories and in low Earth orbit suggest that ejection, entry and impact is survivable for some simple organisms.
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