Pi Day
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A day for celebrating pi
How do astronomers measure distances to stars and galaxies?
Astronomers have developed several techniques to indirectly measure the vast distances between Earth and the stars and galaxies. In many
How do astronomers measure distances to stars and galaxies? Read More »
What do scientists mean when they say space is curved?
Space is indeed curved — in four dimensions. Many people think the fourth dimension is simply time, and for some
What do scientists mean when they say space is curved? Read More »
How was the size of Earth first measured?
Earth’s circumference was first accurately measured more than 2,000 years ago by the Greek astronomer Eratosthenes, who at the time