Astronomers have defined a(n) _______________ around a star as a region within which planets that orbit there have temperatures permitting the existence of liquid water
Fill in the blank(s) with correct word
habitable zone
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Why was the globular cluster M13 selected as the target for the 1974 Arecibo message?
A) globular clusters are the most likely place to find stars with planetary systems B) stars in globular clusters are rich in heavy elements, the building blocks of life C) signals from advanced civilizations have previously been detected coming from this cluster D) globular clusters are densely packed with stars, hence maximizing the probability of interception by an advanced civilization
A resistor of unknown resistance and a 15-? resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf. What is the value of the unknown resistance?
a. 75 ? b. 12 ? c. 7.5 ? d. 30 ? e. 5.0 ?
In which city is Polaris highest in the sky?
A) Singapore B) Mexico City C) Denver D) Anchorage E) All the same, depending on the time of night
An astronomical unit (AU) is equal to the average distance from the Earth to the sun, about 92.9 × 106 mi. A parsec (pc) is the distance at which 1 AU would subtend an angle of 1 second of arc. How many miles are there in a parsec?
What will be an ideal response?