Assignment 6 Flashcards
What is the average temperature of the surface of the sun?
6,000 K
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
Doppler and transit observations
Why don’t we expect to find life on planets orbiting high-mass stars?
The lifetime of a high-mass star is too short
During which era of the Big Bang was the prevailing termperature of the Universe 1 million K?
The Era of Nuclei
It is believed that a class of planets exist that do not orbit a star. By what method have scientists….
Using microlensing
The reason for why the sun shines and produces so much energy was finally explained by Einstein’s
Special theory of relativity
