Answers edited by chandramohanPanakkal

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