What is the ecliptic plane?
A) the plane of Earth's orbit around the Sun
B) the plane of Earth's equator
C) the plane of the Sun's equator
D) the plane of the Milky Way Galaxy
A) the plane of Earth's orbit around the Sun
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What behavior do galactic rotation curves exhibit to suggest the existence of dark matter in an extended halo?
a. Small velocities are seen at large distances from the galactic center. b. Small velocities are seen at distances close to the galactic center. c. Large velocities are seen at large distances from the galactic center. d. Large velocities are seen at distances close to the galactic center.
Why are fossils of early life on Earth rarer than fossils of plants and animals from the past few hundred million years?
A) We find fossils in sedimentary layers, and no sediments were deposited until just a few hundred million years ago. B) Life was far less abundant prior to a few hundred million years ago. C) Early organisms were microscopic and lacked skeletons and other hard structures that are most likely to be fossilized. D) Fossils could not form before there was oxygen in the atmosphere.
Quarks, originally isolated in cosmic ray showers, are elementary particles possessing electric charge equal to 1/3 or 2/3 the magnitude of the charge of a proton
Indicate whether the statement is true or false
When water freezes, the surrounding air is
1) cooled, 2) warmed, 3) unchanged, and when ice melts, the surrounding air is 4) cooled. 5) warmed. 6) unchanged.