Lessons 11 & 12 from Assignment Flashcards
What is the average temperature of the surface of the Sun?
6,000 K
Cluster ages can be determined from
Main sequence turnoff
Where does most star formation occur in the Milky Way today?
In the spiral arms
Which of the following statements about halo stars is false?
halo stars are made entirely out of hydrogen and helium, with no heavy elements
Which of the following is most important for maintaining a stable climate on earth over the time it took for large organisms to evolve?
plate tectonics
A planet’s density can be measured by combining
any method that measures gravitational tug of the planet on a star
Based on DNA studies, it seems that all life on Earth
Shares a common ancestor
Why don’t we expect to find life on planets orbiting high mass stars?
The lifetime of high mass stars is too short
Which of the following is a consequence of Hubble’s Law?
The more distant a galaxy is from us, the faster it moves away from us
During which era of the big bang theory was the prevailing temperature of the universe about one million kelvin?
The era of Nuclei
It is believed that a class of planets exist which do not orbit a star. By what method have scientists learned that there may be twice as many of these types of planets as there are stars in our galaxy?
Doppler method?
The reason for why the sun shines and produces so much energy for billions of years was finally explained by Einstein’s theory of
Special relativity
