Astronomers Have Realized That the Surface of Ida Is Older

question 4

Multiple Choice

Astronomers have realized that the surface of Ida is older than the surface of Gaspra. How do they measure this?

• A) we have radioactive rock samples from each asteroid to analyze
• B) the surface composition (elements and compounds) can easily tell us the ages
• C) from counting craters on each asteroid's surface
• D) from the magnetic field of each body, which weakens with age
• E) it's purely a guess; astronomers have no way of really measuring the ages of these asteroids

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