# What does the technique of interferometry allow it

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18 What does the technique of interferometry allow?
19 What causes stars to twinkle?
20 Earth is made mostly of metals and rocks. Where did this material come from?
What is the acceleration of gravity of Earth?
22 Considering Einstein's famous equation, E=mc2, which of the following statements is true? A small amount of mass can be turned into a large amount of energy. Mass can be turned into energy, but energy cannot be turned back into mass. One kilogram of mass represents 1 joule of energy.
You can make mass into energy if you can accelerate the mass to the speed of light. It takes a large amount of mass to produce a small amount of energy.
23 What does temperature measure?
24 The force of gravity is an inverse square law. This means that, if you double the distance between two large masses, the gravitational force between them weakens by a factor of 4.
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