How might light be captured?
A: Fish net.
B: Hubble Space Telescope.
C: Hobby-Eberly Microscope.
D: Hester gyroscope.
E: Nuclear magnetic resonance spectograph.
Ans: B: Hubble Space Telescope.
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Which of the following explains why navigators prior to a few hundred years ago found it much more difficult to determine longitude than latitude?
A) Determining longitude requires an accurate clock, but latitude does not. B) Determining longitude requires mathematical techniques that were not known at the time. C) Determining longitude requires much more precise measurements of angles in the sky than does latitude. D) Determining longitude requires accurate tables of the celestial coordinates of stars, while determining latitude does not.
No optical traces have been found of the gamma-ray bursters
Indicate whether the statement is true or false
In nickel-based superalloys, aluminum and titanium are added to provide _________-hardening.
Fill in the blank(s) with the appropriate word(s).
The most likely region of the radio spectrum for communication with other civilizations is the water hole, the part of the spectrum
a. near the radio emission of water. b. near the radio emission of oxygen molecules. c. between the radio emission of hydrogen and oxygen. d. between the radio emissions of hydrogen and OH. e. near the radio band where water in the Earth's atmosphere strongly absorbs energy.