Some astronomers believe Pluto's strange and erratic orbit indicates that it wasn't one of the original planets at all, but rather, a moon of Neptune that somehow broke loose.
The universe is about 15,000 million years old. Put another way, if the years flashed by at a rate of one each second, the universe would already be nearly 47 years old.
Some neutron stars spin 600 times a second, which is as fast as a dentist's drill.
The Veil nebula was formed by an explosion which took place over 30,000 years ago, when the first people lived on Earth.
Some subatomic particles discovered by nuclear physicists have a lifetime of just a few trillionths of the trillionth of a second. In this moment, light – which travels from the moon to Earth in 1.25 seconds – moves to no more than the width of a proton.
The weight of the Sun is two billion billion billion tons, about 333,420 times that of the Earth.
Space dust is extremely small – smaller than a particle of smoke – and widely separated, with more than 320 feet between particles.
The word comet comes from the Greek kométes, meaning “wearing long hair.”
Statistically, UFO sightings are at their greatest number during those times when Mars is closest to Earth.
Statistically, UFO sightings are at their greatest number during those times when Mars is closest to Earth.
The world is not round. It is an oblate spheroid, flattened at the poles, and bulging at the equator.
Temperature variations on Mercury are the most extreme in the solar system, ranging from 90 K to 700 K.
There is a correspondence between the fluctuation of agricultural production and sunspot variations. Production of wheat, for example, reached high figures during sunspots maximums and low figures during sunspot minimums.
The Apollo II crew declared "moon walk and moon dust samples" on their U.S. Customs form upon their return from the moon on July 20, 1969.
The Andromeda galaxy is the largest member of our local group of galaxies. The Milky Way is second largest in this group.
If Earth were the size of a quarter, the sun would be as large as a 9-foot ball and would be located a football field's distance from earth.
If one were to capture and bottle a comet's 10,000-mile vapor trail, the amount of vapor actually present in the bottle would take up less than 1 cubic inch of space.
If our whole galaxy were the size of a quarter, our solar system would be less than the size of a molecule. Other galaxies would be from a foot to 1,000 feet away.
If the Milky Way Galaxy was the size of the U.S.A., Earth would be far smaller than the smallest particle of dust, barely visible through the most powerful microscopes.
If the moon were placed on the surface of the continental United States, it would extend from San Francisco to Cleveland (2,600 miles).
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