Space Place
A NASA scientist gives clear answers to fascinating questions about space or Earth science or technology.
Copyright: no copyright
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A NASA astrophysicist explains two ways that Einstein's theories have been proven to allow for time travel into the future.
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A NASA astrophysicist explains why the universe has no center and why scientists think the universe started with a Big Bang.
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A NASA scientist explains why stars are different sizes and how their masses determine their life styles, life spans, and ultimate fates.
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A NASA scientist explains what a black hole is, why the Sun will never become one, and even if it did, why its gravity would not be strong enough to pull Earth inside.
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A NASA scientist explains why Earth rotates, where the Moon may have come from, and why days are 24 hours long instead of 6.
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A scientist answers questions about how, when, and where comets formed, why they behave so strangely, what they are made of, and how to catch one!
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A NASA scientist clears up some of the mystery of gas giant planets--and introduces a few more in the process.
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Clear and simple explanation of the gravitational forces that keep the planets in their orbits, rather than falling into the Sun or flying off into interstellar space. Also, explains how interplanetary spacecraft can take advantage of the gravitational forces to speed up its journey.
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Clear and simple explanation of auroras, the solar activity with which they are associated, and where else besides Earth they might occur.
