21 O Type Stars Can Be Differentiated From F Type Stars 1 Point In That F Type Stars Have Surface Temperatures That 1 (92.75 KiB) Viewed 14 times
21. O-type stars can be differentiated from F-type stars * (1 Point) in that F-type stars have surface temperatures that are low enough such that hydrogen lines are comparatively weak. in that O-type stars have surface temperatures that are so high that all of the metals have been ionized. in that F-type stars have surface temperatures that are so high that all of the metals have been ionized. O in that O-type stars have surface temperatures that are so high that all of the metals are neutral. 22. The asteroid belt * (1 Point) contains all comets in the Solar System. is a region outside of the orbit of Neptune that contains a lot of long-period comets. is a region in the Solar System that contains all of the asteroids in the Solar System. is a region around the Sun from 2.0 to 3.3 AU.
23. Red giant are found * (1 Point) near the bottom left of the H-R diagram. near the bottom right of the H-R diagram. near the top left of the H-R diagram. near the top right of the H-R diagram. 24. To the best of our understanding, planetary systems form * (1 Point) from galactic dust that accretes due to nuclear forces. o from nebulae which contract. o from stars which gravitationally capture planets from distant parts of the galaxy. from stars that eject rocky and metallic material into orbit, creating planets and smaller objects.
25. The celestial equator is * (1 Point) a circle on the celestial sphere that is always at a 90 degree angle with respect to the North Celestial Pole. a circle on the celestial sphere that is on the horizon for all observers. a circle on the celestial sphere that is always at a 180 degree angle with respect to the North Celestial Pole. a circle on the celestial sphere that is always at a 45 degree angle with respect to the North Celestial Pole.
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