The telescope on Mount Palomar, California, can see a distance of 7,038,835,200,000,000,000,000 miles.
Saturn would float on water if there was an ocean large enough to accommodate it because of its density. However, Saturn is 95 times heavier than the Earth.
Scientists believe that hydrogen comprises approximately 90 to 99 percent of all matter in the universe.
Giant flames called prominences shoot out from the Sun's surfaces for 310,000 miles, more than the distance from Earth to the moon. The entire Earth could fit into one of these flames nearly 40 times.
Halley's comet, one of the most famous ever known, returns to Earth every 76 years, and has been observed and recorded for more than 3,000 years
If the world were to become totally flat and the oceans distributed themselves evenly over the earth's surface, the water would be approximately 2 miles deep at every point.
If a baseball-sized piece of a supernova star (known to astronomers as a pulsar) were brought to Earth, it would weigh more than the Empire State building.
If a pin was heated to the same temperature as the center of the Sun, its heat would set alight everything within 60 miles of it.
If a red giant star was the size of an ordinary living room, its energy-generating core would be the size of the period at the end of this sentence.
If an astronaut tried to land on a neutron star, he or she would be crushed by the extremely strong force of gravity, and squashed into a thin layer less than one atom thick.
If an object has no molecules, the concept of temperature is meaningless. That's why it's technically incorrect to speak of the "cold of outer space" — space has no temperature, and is known as a "temperature sink," meaning it drains heat out of things.
If Earth was the size and weight of a table tennis ball, the Sun would measure 12 feet and weigh 3 tons. On this scale, the Earth would orbit the Sun at a distance of 1,325 feet.
If Earth was the size of an apple, the atmospheric layer would be no thicker than the skin of the apple.
If Earth was the size of an apple, the atmospheric layer would be no thicker than the skin of the apple.
The temperature of Earth's interior increases by 1 degree every 60 feet down.
The temperature on the Moon reaches 243 degrees Fahrenheit at midday on the lunar equator. During the night, the temperature falls to -261 degrees Fahrenheit.
Selenologists study the moon, as geologists study earth.
The third Challenger flight carried the first black American into space, Guion Blufo, Jr., on August 30, 1983. A weather/communications satellite was launched for India during the flight.
Since Neptune's discovery in 1846, it has made about three-quarters of one revolution of the sun.
The Ulysses Solar Mission revealed that matter flows outward from the South Pole of the Sun at a rate of one million tons per second.
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