The Kepler mission has been able to measure dimmings of less than 0.01% in a star's brightness. This has allowed us to detect what size planets?

A) planets smaller than Earth
B) planets Earth-size only
C) only planets larger than Earth
D) any size planet, as long as they are in binary star systems


A

Physics & Space Science

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When the northern hemisphere is experiencing winter

What will be an ideal response?

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If the communication lifetime of civilizations in our galaxy is 10,000 years and our galaxy is 13 billion years old, what is the chance of us detecting another intelligent civilization now?

A) 1 in 13,000 B) 1 in 1,300,000 C) 1 in 1300 D) 1 in 130,000

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The determination of the composition of a material by bombarding it with neutrons and monitoring the emitted radiation is

a. nuclear fission analysis. b. nuclear fusion analysis. c. neutron activation analysis. d. nuclear emission analysis. e. beta decay analysis.

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