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A-36_SF
A-36_SF

... Thermodynamic equilibrium: energy generated by fusion = luminosity ...
EXAM II REVIEW
EXAM II REVIEW

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Answer - Brock physics

... 56. The age of the solar system is about (a) 4.6 thousand years. (b) 4.6 million years. (c) * 4.6 billion years. (d) 4.6 trillion years. 57. The age of the Earth is determined by (a) asking the Earth’s mother when it was born. (b) looking up the online records in Encyclopedia Galactica. (c) * radioa ...
AST 301 Introduction to Astronomy - University of Texas Astronomy
AST 301 Introduction to Astronomy - University of Texas Astronomy

... 200 pc, but you don’t need to know that.) The more distant star (Spica) appears fainter. Since it is twice as distant as Canopus, it appears 4 times fainter, or ¼ as bright. We could use the magnitude system to describe how much fainter Spica is than Canopus, but I prefer to talk about fluxes instea ...
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Lecture14

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What is a T Tauri star?

Science Framework for California Public Schools
Science Framework for California Public Schools

... Observations of planetary motions relative to the seemingly fixed stars indicate that planets are much closer to Earth than are the stars. Direct techniques for mea­ suring distances to planets include radar, which makes use of the Doppler effect. Distances to some nearby stars can be measured by pa ...
PHYSICS 1500 - ASTRONOMY TOTAL
PHYSICS 1500 - ASTRONOMY TOTAL

... (b) Almost all comets are gravitationally bound to the Sun (i.e. they do not originate from interstellar space) (c) ...
Name - MIT
Name - MIT

... E) F type 37) For main sequence stars, the general rule is that the lower the surface temperature, … A) the greater the size of the core B) the greater the masses of the stars. C) the less luminous are the stars. D) the greater the diameter of the star E) the shorter the lifetime on the main sequenc ...
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Ch 28 Class Notes

... Because Earth orbits the sun, astronomers experience parallax when they observe the stars. Astronomers can _____________ ______________________________________________________________________________, by knowing the angle between two observed positions and the distance between the observation point ...
SETI: First Considerations (PowerPoint)
SETI: First Considerations (PowerPoint)

... In the ‘steady state,’ there will be at least several billion radiating stars out there. Stars much more massive than the Sun burn up their fuel very quickly, so life won’t evolve much there before it’s gone. But the vast majority of stars are sun-sized or less, and will last a very long time. Some ...
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Homologous Expansion and Contraction Many problems in stellar

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Astronomy Final Study Guide – Name: **This will be the biggest test

... 25. Describe how new stars form. How might supernovas and planetary nebulae contribute to new star formation? ...
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Stellar Evolution - Academic Computer Center

... eventually stops all nuclear fusion but remains extremely hot. • The core will form a White Dwarf star, a very dense, small object about the size of the Earth. • Over time the White Dwarf will cool and dim. • By measuring the temperature of white dwarfs you can estimate how long ago they formed. ...
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17 The Deaths of Stars

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UniverseofGalaxies

... Galaxies with active galactic nuclei AGNs ...
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Stellar Spectra

... Classification of Stars • In the late 19th century astronomers categorized stars according to the strength of the hydrogen absorption lines in the spectrum. • They labels these A, B, ... from strongest to weakest. • Unfortunately, this was the wrong way to do it! ...
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... Students should be able to understand the basic physics underlying complex stellar evolution models Students will learn how to interpret observational characteristics of stars in terms of the underlying physical parameters You should gain an understanding of how stars of different mass evolve, and w ...
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Where do elements come from?

... • After a supernova, a solar nebula is formed which contains heavier elements • This nebula forms new stars with a higher concentration of heavier elements • Our Sun has 67 different elements and is thus a later generation or “recycled” star ...
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MSci Astrophysics 210PHY412

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NIE10x301Sponsor Thank You (Page 1)

... telescope, or with your naked eye, you are seeing light that which was able to measure the speed of light with greater has travelled through space outside our own galaxy for accuracy than any other previous method. Based on his approximately 2.5 million years! experiments, he came to the conclusion ...
Lecture6
Lecture6

How Far Can You See?
How Far Can You See?

... than halfway across the observable universe. From that distance, even the Hubble Space Telescope couldn’t see our Sun — our entire galaxy would be a dim smudge. There’s some evidence that gamma-ray bursts can and do get bright enough so that, looking with nothing more than your own eyes at the right ...
Teacher Sheet 1. What variables does the HR Diagram compare
Teacher Sheet 1. What variables does the HR Diagram compare

... A hotter star should be brighter than a cooler star. All rights reserved. Science NetLinks Student Sheets may be reproduced for educational purposes. ...
30.2 PowerPoint Stellar Evolution
30.2 PowerPoint Stellar Evolution

... Stingray nebula (Hen-1357), the youngest known planetary nebula. ...
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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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