In general, the narrower the spectral line of a star:
A) the hotter the star is.
B) the bigger the star is.
C) the denser the star is.
D) the smaller the star is.
E) the cooler the star is.
Question 2
Why was it thought that Titan may have oceans of methane?
A) Titan's atmosphere contains traces of methane. Similarly, Earth's atmosphere contains traces of water vapor. So, scientist thought Titan should have methane oceans.
B) The atmospheric pressure at Titan's surface and its surface temperature are such that methane should be liquid on Titan's surface.
C) The abundance of hydrocarbons in the atmosphere of Titan, led scientists to believe that Titan had an abundance of methane on its surface.
D) Titan's atmosphere is like Earth's (mostly nitrogen), but its temperature is too low for water to be in the liquid phase. The only other possible liquid was methane.
E) Since Saturn has methane ice in its atmosphere, methane should be abundant in this region of the solar system. The sheer abundance of methane in the region led scientists to hypothesize methane oceans on Titan.
Star Map Eastern Horizon
The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing
The frontal lobe (green) bounded by the Sylvian fissure (yellow line) and central sulcus (red line),
Line analysis of Gustave Caillebotte, Place de l'Europe on a Rainy Day.
Generation of the F2 trihybrid phenotypic ratio using the forked-line method
Sunflower Sea Star, California.