Answers edited by chandramohanPanakkal

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