Optically mapping the Milky Way is made very difficult because of ________ in the disk
Fill in the blank(s) with correct word
dust
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To date, we've found few planets orbiting their stars at distances comparable to the distances of the jovian planets in our solar system. Why do astronomers think this is the case?
A) We have not yet been searching for planets at such distances for a long enough time. B) Planets at such distances are extremely rare. C) No known method can detect planets at such large distances. D) Planets at such distances are probably low in mass.
If a spaceship travels near the speed of light away from the Earth, an observer on Earth would see the length of the spaceship ________
Fill in the blank(s) with correct word
How are galaxies important to our existence?
A) Deep in their centers, galaxies created the elements from which we are made. B) Galaxies recycle material from one generation of stars to the next, and without this recycling we could not exist. C) Without galaxies, the universe could not be expanding. D) Without galaxies, there could not have been a Big Bang.
You spin your little brother on a "helicopter" ride, which means you hold hands and spin around a vertical axis, usually resulting in the little brother's feet lifting off the ground. During the "ride", the acceleration of your brother is
A. outward from you because circular paths always have centrifugal acceleration. B. outward from you, but he pushes you inward. C. inward toward you, but you push him outward. D. tangential to the circular path, and that is why it takes two hands to give helicopter rides. E. inward toward you, and you must pull him inward.