Answers edited by chandramohanPanakkal

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