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----------------- 1743 - Astronomy Facts Two
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- There are 8,768 stars brighter than Magnitude 6.5. Only 8 are brighter than 0.5 to the naked eye.
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-. Uranium and lead meteorites have been measured to be 4.567 billion years old.
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-. The largest impact crater is in South Africa is 190 miles in diameter.
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-. An Astronomical Unit, an AU, is 149,597,870,700 meters long. An AU is the Earth-Sun distance which is about 93 million miles.
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-. Within 32.6 light-years of Earth there are 358 stars.
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-. The largest star found is 1,700 times the diameter of the Sun.
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-. 51 spacecraft have visited Mars. 24 of them were sent by the United States.
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-. Meteors enter our atmosphere at 130,000 to 160,000 miles per hour.
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-. At our equator the rotation speed is 1,028 miles per hour, traveling east. At Jupiter's equator the rotation speed is 27,900 miles per hour.
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-. Mercury's day to night temperature varies -280 F to +800 F. That is a range of 1,080 degrees in temperature change.
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-. The Moon orbits the Earth in 27.3 days, but, the New Moon to New Moon is 29.5 days.
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-. The asteroid Ceres was discovered in 1801. The Dawn spacecraft will visit Ceres in 2015.
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- The largest infrared satellite launched weighed 7,500 pounds. It was named Herschel.
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-. Sedna is a dwarf planet that takes 11,400 years to orbit the Sun.
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-. Mars atmosphere is 95.9 % carbon dioxide, 2 % argon, 1.9 % nitrogen, 0.14 % oxygen, 0.06 % carbon monoxide.
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-. The speed of light in a vacuum is 670,616,629 miles per hour. I
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-. 1994 spacecraft discovered water ice at the Moon's south pole.
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-. The Moon's orbit is moving away from the Earth at 1.5 inches per year due to the loss of energy in Earth’s ocean tides.
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-. The Sun converts 600 million tons of hydrogen into 596 million tons of helium each second.
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-. The Moon reflects only 12 % of sunlight.
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-. The star formation in the Universe today is only 3.33 % of its peak rate.
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-. We are discovering new comets at the rate of one every 2.59 days.
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-. The Space Shuttle flew 135 times between 1981 and 2011.
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-. When the universe was 14 million years old the background temperature was 80 degrees F, a summer day on Earth. Today the background temperature is 2.73 Kelvin, or -455 degrees F.
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-Note: If you like these astronomy facts there are 4 of them each a couple of pages. Reply for copies.
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