The stars Procyon and Betelgeuse both appear equally bright to Earthbound viewers. Yet Betelgeuse emits 5000 times more light than Procyon. Why do they appear to be equally bright?
A) because Betelgeuse is much farther than Procyon
B) because Betelgeuse is undergoing fission, not fusion
C) because Betelgeuse lies in the same plane of Earth's orbit
D) because Procyon is superhot
A
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Atmospheric carbon dioxide levels are currently higher than they have been during the last 400,000 years
a. true b. false
The most widespread negative health impact of air pollution is the
A) destruction of the cellular components of the immune system. B) loss of the ability to absorb vital nutrients by the digestive system. C) disruption of the signaling processes of the endocrine system. D) chronic stress that weakens many systems of the body.
People in the United States are attracted to suburbs in part because suburbs are characterized by
A) heavy traffic. B) lower opportunity for home ownership. C) private land surrounding the house. D) row houses and apartments. E) closer proximity to cultural institutions.
Sunspots numbers cycle roughly every ____________________ years
Fill in the blank(s) with correct word