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17 Cards in this Set

  • Front
  • Back
What is the minimum temperature required for fusion to occur?
10 million K
A star is discovered that has exactly the same surface temperature as our Sun, but is considerably larger in size. Where would it appear on a typical HR diagram, compared to where the Sun is?
Directly above the Sun
What is the correct order for the spectral classes?
A 4 MSun stellar remnant would form a...
Black Hole
When it is done, our Sun will leave behind a..
White Dwarf
The diameter of a typical, middle-sized star is roughly how many times bigger than Earth's?
100 times
What is a planetary nebula?
The outer layers of a low mass star drifting off into space.
What is the highest possible mass for a pulsar?
3 MSun
What is the last element to build up in teh core of an M star (that is, the star of spectral class M)?
The most massive black holes in the Universe are believed to exist in..
According to Hubble's law, on large scales the ________ of a galaxy is proportional to its __________.
redshift; distance
What are the contents of the Universe during the particle era?
Electrons, quarks, antiparticles
During which era of the early Universe were hydrogen nuclei fusing into helium?
Nucleosynthesis Era
Which places in our solar system (other than Earth) are the most likely to have had life at some point?
Mars and Europa
True or False: When a star leaves the main sequence, its mass dramatically increases.
False. Mass never increases, but rather is constantly decreasing.
True or False: All main sequence stars have roughly the same mass.
True or False: The Drake Equation gives an estimate of the number of life forms in the Universe.
False. The Drake Equation gives us the number of technologically advances civilizations in our galaxy.