The Crab nebula is
a. a planetary nebula.
b. a Bok globule.
c. an open cluster.
d. an absorption nebula.
e. a supernova remnant.
e
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What process is illustrated in this diagram?
A) the annihilation of a particle and its antiparticle to make two photons B) the creation of two photons from pure energy C) the formation of an atom with a positive nucleus and a negative electron D) the evaporation of a black hole
What can we learn from studying a planet's magnetic field?
What will be an ideal response?
Volume can be measured in units of m3 . Which of the following unit combinations also result in volume?
a. ft2/m b. cm·ft c. cm2in. d. m2·cm·ft
Giant and supergiant stars are rare because that stage of stellar evolution is short
Indicate whether the statement is true or false