Today, Astronomers Can Measure Distances Directly to Worlds Like Venus

question 27

Multiple Choice

Today, astronomers can measure distances directly to worlds like Venus, Mars, the Moon, or the satellites of Jupiter by

• A) bouncing radar beams off them
• B) using x-ray telescopes
• C) using the Hubble Space Telescope to triangulate with
• D) using Cepheid variable stars that lie behind the planets
• E) sending graduate students out with very long tape measures

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Definitions:

Time

The ongoing and continuous sequence of events that occur in succession, from the past through the present to the future.

Residuals

The variance between actual observed data points and the values forecasted by a computational model.

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