The Moon Raises Tidal Bulges on Earth and as a Consequence

question 25

Multiple Choice

The Moon raises tidal bulges on Earth and as a consequence is being pulled gradually away from Earth. Phobos raises tidal bulges on Mars and as a consequence is being pulled gradually toward Mars. Why this difference?

• A) Phobos orbits Mars with a shorter period than Mars itself rotates.
• B) Phobos is in a polar orbit rather than an equatorial orbit.
• C) Phobos is in a retrograde orbit.
• D) Phobos is in a highly eccentric orbit.

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