Which of the following statements about the recently-discovered object Eris is not true?
A) It is slightly larger than Pluto.
B) It lies well beyond Pluto and Neptune.
C) It is thought to be the first example of a new class of object.
D) It orbits the Sun in the same direction as the other planets.
C
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The hydrogen lines of spectral type A main sequence stars are ____
a. the strongest b. the weakest c. the most narrow d. useful in determining apparent magnitude e. used to estimate the luminosity of the star
Which two classes of objects were critical to the Shapley-Curtiss Debate of 1920?
A) white dwarfs and red giants B) open clusters and emission nebulae C) globular clusters and spiral nebulae D) emission nebulae and spiral nebulae E) planetary nebulae and white dwarfs
Most photosynthesis takes place
a)when animals breathe. b)in tropical forests. c)in the oceans. d)in the atmosphere.
The energy level diagram for hydrogen
The ionization energy of hydrogen is __________.