A standard candle is

A) a 7-cm-long wax candle.
B) another name for a main-sequence star.
C) another name for a barred-spiral galaxy.
D) a light source of known luminosity.


D

Physics & Space Science

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What is Charon?

A) the largest of Pluto's moons B) the largest known Kuiper belt comet C) the largest known asteroid D) a captured moon of Neptune

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A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. How much time is required for the car to reach a speed of 90 km/h?

A) 30 s B) 15 s C) 45 s D) 4.2 s

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Elliptical galaxies are more likely to be found in clusters than are spiral galaxies

Indicate whether the statement is true or false

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