Astronomy

Front 1

interstellar dust can be readily detected by its

Back 1

blocking out of starlight

Front 2

the orion nebula is a

Back 2

giant molecular cloud

Front 3

low mass stars like the sun may possibly form

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in groups within dark clouds

Front 4

on the H-R diagram, where do the first stars to form fall on the main sequence

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upper left

Front 5

for a star like our sun, when fusion reactions int he main sequence phase stop, the star will next become a

Back 5

red giant

Front 6

during the main sequence phase of its like a star fuses

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hydrogen to helium in its core

Front 7

a HERTZSPRUNG-RUSSELL diagram reveals the lives of stars because it shows stars that

Back 7

are at different stages of their lives

Front 8

after a star core runs out of fuel how does the core get to a high enough temp to ignite the next stage of fusion reactions

Back 8

by gravitational contraction

Front 9

which of these is the most important indicator of how a star will evolve

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mass

Front 10

our sun is in envoluntary stage that lies on the _________ of the HR diagram

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main sequence

Front 11

the balance between ___________ forces and ________forces determine the size of a star

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radiation/gravitation

Front 12

the helium flasg occurs when the core collapses, he overall temp rises,, and

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helium begins to burn thru the triple alpha process

Front 13

what is a planetary nebula

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the ejected enevlopr of a red giant surrounding a stellar core remant

Front 14

formed in triple alpha process in red giant stars

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carbon

Front 15

cheif product of main sequence stars, second most common element

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helium

Front 16

3 of these fuse together in the triple alpha process

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helium

Front 17

heaviest common element formed in the most massive stars during their normal lives

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iron

Front 18

formed by main sequence stars by fusing four protons togethers

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helim