Answers edited by chandramohanPanakkal

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