We can measure the parallax of most stars in our galaxy
Indicate whether the statement is true or false
FALSE
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If the objects seen in the past are galaxies, how might they have changed?
A. Galaxies would have had less star formation in the past than at present. B. There were more ellipticals in the past and would be spirals at present. C. Things would have had a larger mass in the past than at present. D. They would have been destroyed by supernovae explosions by the present time. E. The galaxies were more irregular and patchy in the past than they are at present.
At decoupling, the electrons and protons were made from neutron decay
Indicate whether the statement is true or false
An object is placed 15 cm to the left of a convex lens of focal length 20 cm. Where is the image of this object located?
A) 60 cm to the right of the lens B) 60 cm to the left of the lens C) 8.6 cm to the right of the lens D) 8.6 cm to the left of the lens E) 30 cm to the left of the lens
The two types of mechanical energy are ______________ and ______________
Fill in the blank(s) with correct word