The planet Venus does not tilt as it goes around the Sun, so consequently, it has no seasons. On Mars, however, the seasons are more exaggerated and last much longer than on Earth.
The planet Venus is named after the Roman goddess of love.
The point in a lunar orbit that is farthest from the moon is called an "apolune."
The pressure at the center of the Earth is 27,000 tons per square inch. At the center of the giant planet Jupiter, the pressure is three times as great.
The pressure at the center of the sun is about 700 million tons per square inch. It's enough to smash atoms, expose the inner nuclei, and allow them to smash into each other, interact, and produce the radiation that gives off light and warmth.
The seventh planet from the Sun, Uranus, is tipped on its side so that at any moment one pole is pointed at the Sun. The polar regions are warmer than the equator. At the poles, a day lasts for 42 Earth years, followed by an equally long night.
The size of the first footprint on the moon was 13 by 6 inches, the dimensions of Neil Armstrong's boot when he took his historic walk on July 20, 1969.
The smallest planet in our solar system, Pluto, is a little smaller than Earth’s moon.
The smallest visible sunspots have an area of 500 million square miles, about fifty times the size of Africa. The largest sunspots have an area of about 7,000 million square miles.
The star Alpha Herculis is 25 times larger than the circumference described by the earth's revolution around the sun. This means that 25 diameters of our solar system orbit would have to be placed end to end to equal the diameter of the star.
The star Antares is 60,000 times larger than our Sun. If our Sun were the size of a softball, the star Antares would be as large as a house.
The star known as LP 327-186, a so-called white dwarf, is smaller than the state of Texas, yet so dense, that if a cubic inch of it were brought to Earth, it would weigh more than 1.5 million tons.
The star Zeta Thaun, a supernova, was so bright when it exploded in 1054 that it could be seen during the day.
The sun burns 9 million tons of gas a second. At this rate, it has been estimated it will burn out in another 10 billion years.
The sun contains over 99.8 percent of the total mass in our solar system, while Jupiter contains most of the rest. The fractional percentage that is left is made up of our Earth and moon and the remaining planets and asteroids.
The Sun gives off a stream of electrically-charged particles called the solar wind. Every second, the Sun pumps more than a million tons of material into the solar wind.
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