X-rays
Why doesn't fusion happen in your coffee?
How does the number of sunspots on the Sun vary with time?
You discover a large star cluster that is missing all of its massive stars. What does that mean?
You and your friend synchronize your watches (clocks). Then, your friend spends 1 week on the Moon. When yourfriend returns, you compare watches again. What do you find?
The detection of ______ proves the heating source of the Sun?
Why are Sunspots a darker color (i.e. cooler)?
A 3 solar mass black hole has an event horizon of9 km
A binary system is discovered. All that we observed is that star A is a red giant, and star B is a white dwarf. Which of the following do we NOT know about the system?
A 1 solar mass star is dead. How did it move on the HR diagram?
Of all the low-mass red dwarfs (0.08 MSun < M < 0.4 MSun) that have formed since the Universe came into being 14 billion years ago, how many of them are presently on the main sequence?
Sirius currently has a parallax of 0.38 arcseconds. If it
were 2 times farther away, it would have a parallax of
one half, 0.19 arcseconds
Where is a main sequence 25 solar mass star on the HR
diagram?
middle
When the Sun dies it will
blow off its envelope and reveal a white dwarf
What is the main cause of a molecular cloud to collapse and form a star?
Rank from lowest to highest the final state of a star based
on the original mass of the star
White Dwarf, Neutron Star, Black hole
What supports a White Dwarf from collapsing?
If there are two stars of the same surface temperature, but one is bigger than the other, which one is more luminous?
