Answers edited by chandramohanPanakkal

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