Answers edited by chandramohanPanakkal

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