Which Statement About Extrasolar Planets Found to Date Is True

question 60

Multiple Choice

Which statement about extrasolar planets found to date is true?

• A)All are terrestrials, comparable in size to Earth.
• B)Few are found by Doppler shifts of their stars, due to their gravity.
• C)All are more than 2 A.U. from their star.
• D)Most have orbital periods of more than a year.
• E)Some are so close to their stars that their periods are just a few days.

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Definitions:

Grams

A unit of mass in the metric system, used to measure small quantities of substances.

Dimensional-Analysis

A method in mathematics and physics that uses units of measurement to help solve problems involving conversion or comparison of different scales.

Conversion Factor

A mathematical factor used to change one set of units to another by multiplying.

Syringes

Medical instruments used to inject fluids into, or withdraw fluids from, the body.