DSST Astronomy

# 2 astronomy dsst 05mar2012 timespeedsdistances an

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ASTRONOMY DSST 05Mar2012 Time/Speeds/Distances: An angstrom is 1x10-10 meters, used to measure wavelengths, named after who? Anders Angstrom . The speed of light is about 300,000 kilometers or 186,282.397 miles per second. One light year is equal to just under 10 trillion kilometers. (LY): A light year is equal to exactly 9,460,730,472,580.8 km (9 trillion kilometers), about 5,878,625,373,183.61 statute miles (6 trillion miles), or about 0.3066 parsecs. 1 parsec =206,265 AU, 3.26 light years. An astronomical unit (AU) is a unit of length equal to about 149,597,870.7 kilometers (92,955,807.27 miles) or approximately the mean Earth–Sun distance. A day is actually 23:56 hours. A Month is based on the period of revolution of the moon around the Earth. A solar day is one complete rotation of the Earth around the sun. There are about 365 days in a year and 360° in a circle. Therefore, the daily motion of the Earth in its orbit is about one degree. Triangulation . Six quantities describe the dimensions of a triangle: The lengths of the three sides and the values of the three angles. Any three of these quantities in succession around the perimeter of the triangle determine the triangle uniquely. If you have two sides and an included angle or two angles and an included side, you can determine the triangle. Distances can be determined without having to span them directly. Proper Motion . This motion is almost always an angle that is too small to measure with much precision in a single year. In an interval of 20 to 50 years, many stars change their directions by easily detectable amounts. The star of largest known proper motion is Barnard's Star, which changes its direction by 10.25 arcseconds per year. Solar System: Our solar system is located in the Orion arm of the Milky Way , towards the outer edge of the galaxy. The solar system is widely thought to be 4.6 billion years old. Mars: The main component of the atmosphere is Carbon Dioxide (95%) Venus : The average temperature is 800-900 F. It's the most earthlike planet. Its atmosphere is mostly carbon dioxide . What degree Celsius is the temp? answers were (5, 25, 75, 850) Earth: Approx. 4.5 Billion years old. Approx 1 Astronomical Unit (AU) or 92,955,807.27 miles from the sun. Circumference is 24,900 statute miles. 3
ASTRONOMY DSST 05Mar2012 Jupiter: ( Rings) The most volcanically active moon in our solar system is Io. The Jupiter “Great Eye Storm” has been active for over 150 years. Saturn: ( Rings) Saturn’s moon Titan is the only moon to have a fully developed atmosphere. Neptune: ( Rings) Neptune's moon is Triton. Triton is the largest moon of the planet Neptune. It is the only large moon in the solar system with a retrograde orbit (orbiting the opposite direction of its planet's rotation). It's thought to have been captured from the Kuiper belt. Uranus: ( Rings) Asteroids: Bodies of solid rock and metal which are relatively small compared to the planets and orbit the sun. The asteroid belt is located roughly between the orbits of Mars and Jupiter.

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• Winter '12
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• ASTRONOMY DSST

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