Astronomers believe that a spiral galaxy may form
A) from a collision between a small and large galaxy.
B) due to a quasar shutting down.
C) from the sudden contraction of an elliptical galaxy.
D) from the collision of two giant elliptical galaxies.
E) from the explosion of a dwarf irregular galaxy.
A
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A spiral (S or SB) galaxy contains
a. mostly lower-main sequence stars and giants. b. mostly upper main sequence stars and giants. c. mostly upper main sequence stars and gas and dust. d. upper and lower main sequence stars and gas and dust. e. mostly white dwarfs and supergiants.
The _______________ of Jupiter's rings indicated that the rings are made mostly of microscopic particles
Fill in the blank(s) with correct word
When a nucleus in an excited state decays to the ground state, the particle emitted is a(n)
a. alpha particle b. beta particle c. gamma ray d. x ray e. none of the above
Two dogs are pulling on opposite ends of a bone, each with a force of 150N, in opposite directions along the length of the bone. What is the tension in the bone?
A. 0N B. 150N C. 300N D. More information is needed to answer this question.