Where do we find our star on the H-R diagram?
A) In the middle of the main sequence
B) On the far left of the main sequence
C) With the red giants
D) On the lower left
A
Physics & Space Science
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A negative potential energy may be made positive by changing the ______________ point
Fill in the blank(s) with correct word
Physics & Space Science
_____ is the field of study focused on searches for life and possible habitats for such life on other worlds
A) Anthropology B) Sociology C) Ecology D) Astrobiology
Physics & Space Science
The mass density of normal air is, at a particular temperature, 
If the average molecular mass of air is 29.0 u, how many air molecules are in spherical balloon of radius 15.0 cm?
a. 
b. 
c. 
d. 
e. 
f. 
Physics & Space Science
Stars less massive than about 0.4 solar mass are referred to as _____
A) brown dwarfs B) red dwarfs C) yellow dwarfs D) white dwarfs
Physics & Space Science