Everyday Science Exercise 7 ( The Universe )

Everyday Science Exercise 7 ( The Universe )

• Cheron is the moon of Pluto
• Total number of satellites are 31 (chk: 50)
• Blue color of sky is due to Tyndal Effect
• Our solar system contains 50 satelites
• Total planets in solar system are 8
• Distance of sun from earth is 150 million km = 1 a.u (angstrom unit)
• Moon from earth is 385,000 km
• Outer surface of sum is called photosphere
• Sun has 90% hydrogen, 8% helium and 2% other elements.
• Temperature at surface of sun is 6000K and at its center 20 million K
• Venus reflects highest percentage of light
• Morning star is called to Venus.
• Venus is the only planet that rotates clockwise
• Rhea is the fifth natural satellite of Saturn.
• Speed of earth in orbit around sun is 8.5 miles per second.
• The only planet which rotates on its axis from East to West is Uranus
• Uranus is called lopsided planet
• Uranus contain atmosphere of Hydrogen and Helium
• Period of rotation of earth on axis is 1 day or 23 hrs, 56 minutes & 4.09 seconds.
• Period of revolution of Earth around Sun is 356 days, 6 hrs, 9 minutes & 9.54 seconds.
• Volume of Earth is 260 billion cubic miles.
• Weight of earth is 6586x10 power 18 tons
• Rings of Saturn were discovered by Galileo in 1610
• Titan, the largest moon in solar system is of Saturn
• Triton is a satellite of Neptune
• Planet referred as Morning Star and Evening Star is Venus
• Venus’ atmosphere is 90 times thicker than earth’s.
• The temperature of Venus’ surface is about 430 deg: C
• Biggest Comet known to man is kohoutek
• Only planet whose day is longer than its year is Venus
• Brightest visible star is Sirus
• Star nearest to earth is Sun
• Atmosphere of sun has 3 layers
• Sun spots are the cooler areas of sun
• In 28 days moon returns to the same position in its orbit
• The light coming from stars give the idea of their temperature.
• A light year is equal to 9.46 trillion km
• Sun radiated energy equal to 10 trillion of TNT explosion
• Mercury is nearest to the sun, smallest and fastest planet, with shortest rotation time. Moon = 0
• Venus is the brightest, hottest, closest to earth and earth’s twin in size and mass, has largest quantity
• CO2 Moon = 0
• Earth is most dense, watery, bios planet. Moon = 1
• This is an instrument used for measuring the altitude of a celestial body: sextant
• Mars moon = 2- Phobos and Deimos
• Mars is named after the Roman god of war.
• Mars is called Red planet
• Mars is half the size of earth
• Europa is a moon of Mars
• Mars contain atmosphere of carbondioxide