Answers edited by chandramohanPanakkal

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