Answers edited by chandramohanPanakkal

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