Showing posts from August, 2011

How Do We Know the Earth Goes Round the Sun?

Is the Universe Infinite?

How Can We Measure the Expansion of the Universe?

What is a White Hole?

Where am I?

15 Things You Didn't Know About Space

How Can Astronauts See Stars With Their Eyes Shut?

What are arcseconds and arcminutes?

Have any planets outside our Solar System been spotted by telescope?

How did the Universe come from Nothing?

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