PSU ASTRO 1 - Exam 3 Study Guide.pdf file:///C:/Users/HP/Desktop/dddd/PSU%20ASTRO%201%20-%20
PSU ASTRO 1 - Exam 3 Study Guide
1. Explain how a white dwarf's observable properties (specifically Luminosity& Temp)
change over billions of years if it is left alone, and show how its location would change on
an H-R diagram.
ANS •White Dwarfs are low-mass stars, and if they are left alone, they will fade and cool
forever.
• If mass transfer adds mass to a White Dwarf, it can become, (1) a Nova, or (2) aSupernova
2. Compared to a white dwarf, a neutron star's density is?
ANS •Not all neutron starsare called pulsars because not all neutron stars send this signal in a
direction that astronomers can detect them.
3. Which statement is necessarily true?
A. Every pulsar is a neutronstar
B. Every neutron star is a
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,PSU ASTRO 1 - Exam 3 Study Guide.pdf file:///C:/Users/HP/Desktop/dddd/PSU%20ASTRO%201%20-%20
pulsar
C. both
ANS A. Every pulsar is a neutronstar
4. Compared to a neutron star, a black hole's density is?
ANS
5. If our Sun were suddenly compressed to a black hole (BH) of the Sun's samemass, Earth
would...
ANS maintain the same orbit
6. What happens to as you get closer and closer to the center of a black hole(BH)?
ANS It increases without bound
7. How long does it take light to travel from the center of our galaxy tous?
ANS 25,000 years
8. About how far are we (the Sun & our solar system) from the center of thegalaxy?
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