A 30-year-old astronaut goes off on a long-term mission in a spacecraft that travels at speeds close to that of light
The mission lasts exactly 20 years as measured on Earth. Biologically speaking, at the end of the mission, the astronaut's age would be
A) exactly 50 years.
B) exactly 25 years.
C) less than 50 years.
D) more than 50 years.
E) exactly 30 years.
C
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Provided following are stages that occurred during the formation of our solar system. Rank these stages from left to right based on when they occurred, from first to last.
What will be an ideal response?
Most interstellar clouds are:
A) much bigger than our solar system. B) about the size of Earth. C) similar in size to clouds in Earth's atmosphere. D) much smaller than the clouds in Earth's atmosphere. E) about the size of a wavelength of light.
Uranus was discovered
A) after examining perturbations in Neptune's orbit. B) less than 250 years ago. C) thousands of years ago. D) by Galileo. E) with a radio telescope.
What do you think are the reasons that European buildings are in general more energy-efficient than American buildings?
What will be an ideal response?