Astronomy Final Review UWRF PHYS117 Questions and Answers 100% Solved correctly

Ursa Major - Answer-circumpolar constellation at 45N Big dipper - Answer-asterism Orion - Answer-asterism Taurus - Answer-zodiac constellation Draco - Answer-circumpolar at 45N Northern Cross - Answer-asterism Your birth sign is - Answer-the constellation behind the sun at the moment of your birth We are currently living in the age of - Answer-Pisces What is the location of of our solar system in the Milk Way galaxy? - Answer-Halfway out from the center How do we know the Milky Way galaxy is a barred spiral type? - Answer-maps of 21-cm radiation from objects forming "arms" When protostars form by gravitational collapse within the nebula the characteristic that determines how long it takes for fusion to begin is - Answer-the total mass of collapsed gas We say a star is born when it - Answer-begins fusionWhen hydrogen atoms in a warm nebula convert from a parallel to antiparallel spin state they emit - Answer-21-cm radio wave When we say the stars have proper motion we mean their motion is - Answer-physical motion through space The latest online star catalog developed by the European Space Agency contains data on star motion and position collected by this spacecraft - Answer-HIPPARCOS When we see a red giant star we know - Answer-the star will die soon When the sun dies it will become a planetary nebula surrounding a - Answer-white dwarf We see radio waves pulsing from a pulsar because - Answer-the star is rotating like a lighthouse Who developed the theory of how stars die based on their mass? - Answer-Chandrasekhar A black hole is actually a - Answer-massive dead star Which of the following is a blue giant star? a) Vega b) Capella c) Betelgeuse d) Rigel - Answer-d) Rigel Which of the following best describes a star's spectrum? a) a blackbody spectrum with a superimposed absorption line spectrum b) a blackbody spectrum with a superimposed emission line spectrum c) a continuous spectrum with no wavelengths missingd) an emission line spectrum only - Answer-a) a blackbody spectrum with a super imposed absorption line spectrum When we say a red star is cooler than a blue star, we are comparing this kind of spectrum for the stars: a) absorption line b) emission line c) blackbody d) special relativistic - Answer-c) blackbody The star Procyon has an apparent magnitude of +0.35 and an absolute magnitude of +2.6. What does this tell you about its actual distance? a)it is farther from us than 10pc b)it is closer to us than 10pc c)it is about 10pc away d)magnitudes give no clue to distance - Answer-b) it is closer to us than 10pc If a star's angle of parallax is 1 arc second, its distance is 1 parsec. If a star's angle of parallax is 0.5 arc seconds, its distance a) is closer than 1 parsec b) is farther than 1 parsec c) is still just 1 parsec d) can't be determined without more information - Answer-b) is farther than 1 parsec