Which statement is true?
A) If we could build a spaceship capable of traveling at a speed near the speed of light, passengers on the ship could make a journey to a star that is 500 light-years away within their lifetimes.
B) If we could build a spaceship capable of traveling at a speed near the speed of light, we could send a ship to a star that is 500 light-years away and it would return just a few years after we launched it.
C) Thanks to effects of special relativity, we could build a spaceship that could go close to the speed of light with much less fuel than we would have guessed from Newton's laws of motion.
D) Because special relativity tells us that we cannot reach or exceed the speed of light, it means that distant stars will never be within our reach because the time required to reach them will always be quite long, even with fast spaceships.
A) If we could build a spaceship capable of traveling at a speed near the speed of light, passengers on the ship could make a journey to a star that is 500 light-years away within their lifetimes.
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A ____ is produced by ionized gas carried away from the comet by solar wind
a. nucleus b. coma c. dust tail d. gas tail e. chondrule
While we can't completely rule out a connection between the sunspot cycle and weather cycles on Earth, most scientists doubt there is a significant effect because
A) the Sun's luminosity changes less than about 0.1% between minimum and maximums of the sunspot cycle. B) the Sun is too far away to affect Earth's weather. C) there are no known cycles in weather or climate that last as long as the sunspot cycle. D) sunspots are linked to the Sun's magnetic field, which could not possibly have any effect on Earth.
The Sun's visible surface (that is, the surface we can see with our eyes) is called the
A) photosphere. B) chromosphere. C) corona. D) core.
Which of these undergoes circular motion?
a. A bullet shot from a gun. b. A top spinning on a table. c. A baseball hit by a bat. d. A satellite orbiting the Earth. e. An apple falling out of a tree.