Answers edited by chandramohanPanakkal

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