What makes white-dwarf supernovae very good standard candles for distance measurements?
A) They are very bright, so they can be used to determine the distances to galaxies billions of light-years away.
B) They should all have approximately the same luminosity.
C) They occur so frequently that we can use them to measure the distances to virtually all galaxies.
D) We have had several occur close to us in the Milky Way, so we have been able to determine their luminosities very accurately.
E) both A and B
Question 2
Photography with film is still the preferred way of capturing fine detail in the faintest, most distant galaxies.
Indicate whether the statement is true or false
Growth hormone disorders. Illustration of a pituitary giant and a pituitary dwarf, both adults of ab
The grey side-gilled sea slug Pleurobranchaea maculata. The discovery of tetrodotoxin in this slug i
A Brown Dwarf
In 2008, the U.S. economy suffered a gaping wound as several trillion dollars were ripped out of it.
Types of white blood cells.
To help make good electrical contact with the terminals without doing any harm, select the ...