Astr 181 - Study guides, Class notes & Summaries
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ASTR 181 EXAM 1 2024 WITH 100% CORRECT ANSWERS
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How many stars are in our galaxy? - correct answer 4 x 10^11 
 
What is our cosmic address? - correct answer Earth 
Solar System 
Interstellar Neighborhood 
Milky Way 
Lanieakea 
Observable Universe 
Infinite Universe 
 
What is an astronomical unit? - correct answer The average distance between the Sun and the Earth 
 
As a blackbody becomes hotter, it also becomes ______ and ______. - correct answer More luminous, bluer. 
 
If an electromagnetic wave's frequency increased, then - correct ...
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ASTR 181 |93 Final Sem Exam And Answers|2024
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________ allow gasses and to escape the sun, creating solar wind. - ️️Open field lines 
A planet in orbit around the Sun is accelerating toward the Sun because ______ . - ️️Its direction is constantly changing 
A star is 230 light years away. Therefore, the light we see tonight left the star _______ years ago. - ️️230 
A star's luminosity describes ______ . - ️️How much energy the star gives off each second 
Absolute magnitude is _______ . - ️️How bright a star appears at 10...
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ASTR 181|96 Exam 1 Questions With Answers|2024
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A hydrogen atom that has been photoionized is _____. - ️️An ion, a proton, and positively charged. 
A main sequence O star will have a ___ temperature, a ____ radius, a ____ luminosity and a ____ absolute magnitude than a main sequence G star like the Sun. - ️️larger, larger, larger, smaller 
A star that is 50 pc away will show a parallax of _____. - ️️.02 arc secs 
A star with T=10,000 K (spectral type A) shows strong absorption lines from _______. - ️️neutral hydrogen (H I) 
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