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Astro 1 Final Exam PSU QUESTIONS WITH CORRECT ANSWERS
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Astro 1 Final Exam PSU QUESTIONS WITH CORRECT ANSWERS
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Astro 1 Final Exam PSU QUESTIONSWITH CORRECT ANSWERS
What is a light year? - CORRECT ANSWER-distance that light travels in 1 year
What is the closest star to Earth besides the Sun? (4.2 ly away) - CORRECT ANSWER-proxima centauri
What is the age of the universe? - CORRECT ANSWER-14 billion years
What is our cosmic address? What is the Local Group? - CORRECT ANSWER-Earth, solar system, milky
way galaxy, local group, local supercluster
Order of planets in our solar system - CORRECT ANSWER-Mercury, venus, earth, mars, jupiter, saturn,
uranus, neptune
What is the fastest speed in the universe? - CORRECT ANSWER-speed of light
Typical composition of stars - CORRECT ANSWER-74% H, 25% He, 1% Metals
How old is the Sun/solar system? How much longer will it live? - CORRECT ANSWER-4.5 billion, live to 10
billion
What is a star? - CORRECT ANSWER-glowing ball of hot dense gas that generates its own energy via
nuclear fusion
What is the reason that we have seasons on Earth? - CORRECT ANSWER-tilt of the earth's axis
determines what hemisphere leans towards the sun
If Earth's orbit were a perfect circle, how would this affect seasons? - CORRECT ANSWER-Would not
because earth's orbit is already very close to a perfect circle
Astro 1 Final Exam PSU QUESTIONS WITH CORRECT ANSWERS
, moon phases in order - CORRECT ANSWER-new moon, waxing crescent, first quarter moon, waxing
gibbous, full moon, waning gibbous, third quarter moon, waning crescent
How long does it take to complete all the phases? - CORRECT ANSWER-29.5 days
What are the two types of eclipses (only solar and lunar) and what phase does the Moon need
to be in for each one of the eclipses to occur? - CORRECT ANSWER-lunar: earth blocks sunlight from
moon, full moon
solar: moon passing directly in front of sun, new moon
If you see that the Moon is full, what phase will someone in Australia see? What about
someone on the Moon looking at Earth? - CORRECT ANSWER-the same phase, the moon will just look
upside down
people on the moon wouldn't see earth (new earth)
Kepler's laws - CORRECT ANSWER-1.) a^3=p^2(M1+M2)
2.) when planet is closer to sun, it moves faster in its orbit
3.) planets further from sun orbit slower
How can you tell a color of a star based on its blackbody curve? - CORRECT ANSWER-peak of curve in
visible spectrum
order of different types of electromagnetic radiation by wavelength - CORRECT ANSWER-gamma, x ray,
uv, visible, infrared, microwave, radio
What needs to happen inside an atom to produce an absorption or an emission line? - CORRECT
ANSWER--emission: excited state (electron is in an energy level above the lowest possible one)
-absorption: moving to a higher energy level (photon of just the right energy is absorbed by the atom)
Astro 1 Final Exam PSU QUESTIONS WITH CORRECT ANSWERS
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