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Life Cycles of Stars
Life Cycles of Stars

Introduction to Astronomy
Introduction to Astronomy

The distance that light travels in a year is 9.5 trillion km. The
The distance that light travels in a year is 9.5 trillion km. The

... Put the following in order from closest to the Earth to farthest away: Sun, Andromeda Galaxy, Constellation, Neptune ...
15.4 Star Systems and Galaxies
15.4 Star Systems and Galaxies

... A. Star system-groups of two or more stars 1. Binary stars - two stars or double stars a. Eclipsing binary-a system in which one star blocks the light from another II. Planets Around Other Stars A. Astronomers study gravitational effects on stars to see if there is a planet III. Galaxies-classified ...
Study Guide_galaxies, Tools, and Stars Test
Study Guide_galaxies, Tools, and Stars Test

... 6. Name and describe the 3 types of galaxies. 7. Where is our solar system located in the Milky Way galaxy? 8. What is a light year? 9. What contains all the matter and energy that exists? 10. Name two types of optical telescopes. 11. What do radio telescopes receive and where do they come from? 12. ...
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...  Very bright meteors are known as fireballs.  A small number of meteorites have been shown to be of Lunar (23 finds) or Martian (22) origin. ...
POWERPOINT JEOPARDY - Mr. Dalton
POWERPOINT JEOPARDY - Mr. Dalton

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... •The theory that the present day universe began with a huge still ...
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22.2 Stars Change Over Their Life Cycles

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Grade 9 Academic Science – Space
Grade 9 Academic Science – Space

... Use your textbook to complete the sentences. NOTE: The phrases are not replicated from the textbook. You may have to think about your answer. As well, words can be used more than one time. Alien ...
Earth in the Universe
Earth in the Universe

< 1 ... 149 150 151 152 153

Future of an expanding universe

Observations suggest that the expansion of the universe will continue forever. If so, the universe will cool as it expands, eventually becoming too cold to sustain life. For this reason, this future scenario is popularly called the Big Freeze.If dark energy—represented by the cosmological constant, a constant energy density filling space homogeneously, or scalar fields, such as quintessence or moduli, dynamic quantities whose energy density can vary in time and space—accelerates the expansion of the universe, then the space between clusters of galaxies will grow at an increasing rate. Redshift will stretch ancient, incoming photons (even gamma rays) to undetectably long wavelengths and low energies. Stars are expected to form normally for 1012 to 1014 (1–100 trillion) years, but eventually the supply of gas needed for star formation will be exhausted. And as existing stars run out of fuel and cease to shine, the universe will slowly and inexorably grow darker, one star at a time. According to theories that predict proton decay, the stellar remnants left behind will disappear, leaving behind only black holes, which themselves eventually disappear as they emit Hawking radiation. Ultimately, if the universe reaches a state in which the temperature approaches a uniform value, no further work will be possible, resulting in a final heat death of the universe.
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