Answers edited by chandramohanPanakkal

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• How does solar energy convert the heat energy into electrical energy?
  
• Do all stars look like our sun?
  
• Do astronomers have satellites orbiting other planets in our solar system?
  
• How many parsec are in one kilometer?
  
• How is electromagnetic radiation used in communication?
  
• What is beyond our solar system?
  
• How many orbits had the sun completed just after the formation of solar system?
  
• Which way does the moon and earth rotate around the sun?
  
• How do you calculate the distance between earth and a star?
  
• Which is the nearest star to the Earth: The Sun or Alpha Centauri?
  
• When and where did Giuseppe Piazzi live and work?
  
• What are the colors of the stars from hottest to coldest?
  
• Is a yellow star, such as the sun, hotter or cooler than an orange star?
  
• What enables us to see different stars and constellation during different seasons?
  
• How does looking at the sun damage your eye?
  
• How was the size of earth first measured?
  
• How is electromagnetic radiation produced on the sun?
  
• Why is the Sun different from other stars in the universe?
  
• What is the size of the Earth's surface?
  
• Does the earth spin slower on the northern and southern latitudes ?
  
• What causes a nova explosion?
  
• Why does the moon exhibit phases?
  
• What does the Hubble Space Telescope do?
  
• How do scientists test the pH of soil?
  
• Question #ec6d0
  
• How do refracting telescopes work?
  
• Why was Pluto discredited as a planet?
  
• How does the solar system move?
  
• What are the approximate size differences between the Earth and the Moon?
  
• How do nuclear energy plants work?
  
• What are some similarities and differences between Venus and Earth?
  
• What is the primary event that lead to the formation of the moon?
  
• 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 aneroid barometer works?
  
• Why are the images sent from Mars in black and white rather than color?
  
• How do refracting and reflecting telescopes differ?
  
• What is the circumference of the Earth's orbit around the Sun?
  
• What is earth's size relative to the galaxy?
  
• Why did Galileo's observations of Venus help to disprove the geocentric model of the solar system?
  
• Who was the first person to observe the moon through a telescope? What features of the moon did he identify?
  
• What planet is closest to the moon in the night sky?
  
• How long would it take us to travel to Pluto in years?
  
• What do stars and planets look like from a telescope? Does their appearance vary depending on the type of telescope used?
  
• How does the sun affect our tides?
  
• How can electric energy be produced?
  
• What are all the planets relative size compared to earth's?
  
• 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?
  
• When a comet is at perihelion does it have a brighter tail?
  
• How many parsecs are in one mile?
  
• What is the distance from earth to the sun in light years?
  
• How bright is a full moon in comparison to the Sun?
  
• What are the southern hemisphere constellations?
  
• What is the circumference of the orbit of earth around sun? Is it different for each year?
  
• What is the largest man-made satellite orbiting the earth?
  
• Question #5243b
  
• Where did the Apollo Missions land on the moon?
  
• What are the two major forces that act on a star?
  
• What are circumpolar stars?
  
• How does natural gas convert to energy?
  
• What are sun and stars made of?
  
• How far are we away from the sun during the winter compared to the summer?
  
• What causes the earth to tilt back and forth to give us the seasons?
  
• Which planet in our solar system is most earth like?
  
• What are all the planets relative size compared to earth's size?
  
• At what point does the ecliptic cut the celestial equator?
  
• What is the life cycle of a star?
  
• What are the sizes of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto?
  
• How does an electric motor operate?
  
• Why are astronomical units used?
  
• When is the tail of a comet the shortest?
  
• What is the approximate speed at which the earth orbits the sun?
  
• What evidence supports theories that water once flowed on Mars?
  
• What is diurnal rotation of the earth?
  
• Who discovered the size of earth?
  
• Why do the planets all orbit in planes very close to the ecliptic?
  
• What is precession?
  
• What theory describes the formation of the moon?
  
• What is the nearest star to earth?
  
• What is the angle of tilt of the earth with the vertical axis?
  
• What are the Jovian planets? Where are they found?
  
• How does looking at the sun damage your eye?
  
• 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?
  
• Saturn is approximately 1.5 billion kilometers from the sun. What is this distance in AU?
  
• What causes moon phases? Why is there only one full moon a month?
  
• How does looking at the sun damage your eye?
  
• 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?
  
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