A large gas cloud in the interstellar medium that contains several type O and B stars would appear to us as:
A) a dark nebula.
B) an emission nebula.
C) bright blue.
D) a reflection nebula.
E) a dark patch against a bright background.
B
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The large planetesimals would have grown faster than the smaller planetesimals because
a. they were moving faster in their orbits than the smaller planetesimals. b. their stronger gravity would pull in more material. c. there was more material located near them that could be accreted. d. the smaller planetesimals were covered by a layer of material that was lost during collisions. e. All of the other choices are correct.
The Earth rotates 360 degrees on its axis
twice a day such that the Sub rises in the West and sets in the East. once a day such that the Sun rises in the East and sets in the West. twice a day such that the Sun rises in the East and sets in the West. once a day such that the Sun rises in the West and sets in the East.
If sunlight peaks at 0.55 ?m wavelength, this infers a surface temperature of the sun of how many thousand degrees Kelvin?
A) 9.5 B) 5.3 C) 2.5 D) 25. E) 15.
By casually glancing at a scene on your TV you are
A) affecting the image. B) participating in the action on the screen. C) both of these D) neither of these