Answers edited by chandramohanPanakkal

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• Which way does the moon and earth rotate around the sun?
  
• Why do the planets all orbit in planes very close to the ecliptic?
  
• What is the approximate speed at which the earth orbits the sun?
  
• Who was the first person to observe the moon through a telescope? What features of the moon did he identify?
  
• How do refracting telescopes work?
  
• How long would it take us to travel to Pluto in years?
  
• What are the southern hemisphere constellations?
  
• How long does it take to receive pictures from Mars? When the Phoenix takes pictures on the surface, how long does it take for the pictures to get to us on Earth?
  
• What evidence supports theories that water once flowed on Mars?
  
• What is the primary event that lead to the formation of the moon?
  
• How is electromagnetic radiation produced on the sun?
  
• How many parsec are in one kilometer?
  
• What is the largest man-made satellite orbiting the earth?
  
• How is electromagnetic radiation used in communication?
  
• What are sun and stars made of?
  
• What is the circumference of the Earth's orbit around the Sun?
  
• What causes moon phases? Why is there only one full moon a month?
  
• What do stars and planets look like from a telescope? Does their appearance vary depending on the type of telescope used?
  
• What causes a nova explosion?
  
• What is precession?
  
• Why was Pluto discredited as a planet?
  
• Question #ec6d0
  
• Why can't we get a picture of the lunar rover sitting on the surface of the moon with earth-based telescopes?
  
• When a comet is at perihelion does it have a brighter tail?
  
• What is the nearest star to earth?
  
• What are the two major forces that act on a star?
  
• Question #5243b
  
• What is beyond our solar system?
  
• How can electric energy be produced?
  
• When and where did Giuseppe Piazzi live and work?
  
• How does an electric motor operate?
  
• How does aneroid barometer works?
  
• How does looking at the sun damage your eye?
  
• How does looking at the sun damage your eye?
  
• What does the Hubble Space Telescope do?
  
• Why are the images sent from Mars in black and white rather than color?
  
• What are all the planets relative size compared to earth's?
  
• What is the circumference of the orbit of earth around sun? Is it different for each year?
  
• Do all stars look like our sun?
  
• When is the tail of a comet the shortest?
  
• Saturn is approximately 1.5 billion kilometers from the sun. What is this distance in AU?
  
• What is the angle of tilt of the earth with the vertical axis?
  
• Do astronomers have satellites orbiting other planets in our solar system?
  
• What are the approximate size differences between the Earth and the Moon?
  
• What planet is closest to the moon in the night sky?
  
• Which planet in our solar system is most earth like?
  
• What theory describes the formation of the moon?
  
• Why does the moon exhibit phases?
  
• What are all the planets relative size compared to earth's size?
  
• How do nuclear energy plants work?
  
• What is earth's size relative to the galaxy?
  
• Suppose we observe a Cepheid variable in a distant galaxy that brightens and dims with a regular period of about 10 days. What can we learn from this observation?
  
• Why did Galileo's observations of Venus help to disprove the geocentric model of the solar system?
  
• What are circumpolar stars?
  
• What is diurnal rotation of the earth?
  
• Is a yellow star, such as the sun, hotter or cooler than an orange star?
  
• How many parsecs are in one mile?
  
• What are the sizes of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto?
  
• Where did the Apollo Missions land on the moon?
  
• What is the distance from earth to the sun in light years?
  
• How does the solar system move?
  
• How does looking at the sun damage your eye?
  
• What are the Jovian planets? Where are they found?
  
• Which is the nearest star to the Earth: The Sun or Alpha Centauri?
  
• What causes the earth to tilt back and forth to give us the seasons?
  
• How does the sun affect our tides?
  
• What is the life cycle of a star?
  
• Why is the Sun different from other stars in the universe?
  
• What are the colors of the stars from hottest to coldest?
  
• How many orbits had the sun completed just after the formation of solar system?
  
• How do you calculate the distance between earth and a star?
  
• Where are the cepheid variables? Can we see any from earth without a telescope?
  
• How do scientists test the pH of soil?
  
• What enables us to see different stars and constellation during different seasons?
  
• How was the size of earth first measured?
  
• How does solar energy convert the heat energy into electrical energy?
  
• What is the size of the Earth's surface?
  
• How does natural gas convert to energy?
  
• Why are astronomical units used?
  
• What are some similarities and differences between Venus and Earth?
  
• How far are we away from the sun during the winter compared to the summer?
  
• Who discovered the size of earth?
  
• How do refracting and reflecting telescopes differ?
  
• At what point does the ecliptic cut the celestial equator?
  
• How do spacecrafts like Voyager 1 and 2 transmit pictures of space back to Earth? How do they receive flight instructions from such a long distance from earth?
  
• How bright is a full moon in comparison to the Sun?
  
• Does the earth spin slower on the northern and southern latitudes ?
  
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