The ionized helium lines show up only in class ________ stars
A) K B) B C) O D) M E) F
C
You might also like to view...
Gravitational lensing can be used to detect the presence of dark matter
a. True b. False Indicate whether the statement is true or false
___________ have elongated nuclei with spiral structure extending from the ends of the elongations. The Milky Way is a member of this class of galaxy
a. Spiral galaxies b. Barred spiral galaxies c. Elliptical galaxies d. Irregular galaxies e. S0 galaxies
How far away on average is the Earth from the Sun?
Why was the Martian meteorite ALH84001 singled out for intense study?
A) it is the only Martian meteorite that has even been discovered B) the meteorite appeared to be giving off methane gas C) it is a very young rock originating from the Tharsis region D) it is a very old rock, dating back from the time when Mars probably had liquid water on its surface