Answers edited by chandramohanPanakkal

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• How does an electric motor operate?
  
• What is the circumference of the Earth's orbit around the Sun?
  
• How does natural gas convert to energy?
  
• What is the nearest star to earth?
  
• How is electromagnetic radiation used in communication?
  
• Question #5243b
  
• What is the approximate speed at which the earth orbits the sun?
  
• Why was Pluto discredited as a planet?
  
• What theory describes the formation of the moon?
  
• 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?
  
• Which planet in our solar system is most earth like?
  
• What are circumpolar stars?
  
• How long would it take us to travel to Pluto in years?
  
• How bright is a full moon in comparison to the Sun?
  
• What is precession?
  
• Do all stars look like our sun?
  
• How does aneroid barometer works?
  
• What are the southern hemisphere constellations?
  
• How do you calculate the distance between earth and a star?
  
• How many parsecs are in one mile?
  
• How can electric energy be produced?
  
• What is beyond our solar system?
  
• What is the primary event that lead to 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?
  
• When and where did Giuseppe Piazzi live and work?
  
• How is electromagnetic radiation produced on the sun?
  
• How was the size of earth first measured?
  
• How many orbits had the sun completed just after the formation of solar system?
  
• Where are the cepheid variables? Can we see any from earth without a telescope?
  
• Do astronomers have satellites orbiting other planets in our solar system?
  
• 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?
  
• When is the tail of a comet the shortest?
  
• What are some similarities and differences between Venus and Earth?
  
• What is the angle of tilt of the earth with the vertical axis?
  
• Who discovered the size of earth?
  
• What is the size of the Earth's surface?
  
• How does looking at the sun damage your eye?
  
• Why does the moon exhibit phases?
  
• How do nuclear energy plants work?
  
• What are the Jovian planets? Where are they found?
  
• Which is the nearest star to the Earth: The Sun or Alpha Centauri?
  
• How does the sun affect our tides?
  
• Who was the first person to observe the moon through a telescope? What features of the moon did he identify?
  
• How does the solar system move?
  
• 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 causes moon phases? Why is there only one full moon a month?
  
• What evidence supports theories that water once flowed on Mars?
  
• Does the earth spin slower on the northern and southern latitudes ?
  
• What is the distance from earth to the sun in light years?
  
• What does the Hubble Space Telescope do?
  
• 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 are the colors of the stars from hottest to coldest?
  
• Why do the planets all orbit in planes very close to the ecliptic?
  
• What enables us to see different stars and constellation during different seasons?
  
• What are all the planets relative size compared to earth's size?
  
• What planet is closest to the moon in the night sky?
  
• What causes the earth to tilt back and forth to give us the seasons?
  
• What causes a nova explosion?
  
• What are the approximate size differences between the Earth and the Moon?
  
• Which way does the moon and earth rotate around the sun?
  
• Why are the images sent from Mars in black and white rather than color?
  
• How does looking at the sun damage your eye?
  
• Why are astronomical units used?
  
• Saturn is approximately 1.5 billion kilometers from the sun. What is this distance in AU?
  
• Why is the Sun different from other stars in the universe?
  
• What is the life cycle of a star?
  
• How do refracting telescopes work?
  
• What is the largest man-made satellite orbiting the earth?
  
• How many parsec are in one kilometer?
  
• At what point does the ecliptic cut the celestial equator?
  
• What are the two major forces that act on a star?
  
• What are all the planets relative size compared to earth's?
  
• How does looking at the sun damage your eye?
  
• When a comet is at perihelion does it have a brighter tail?
  
• Where did the Apollo Missions land on the moon?
  
• How does solar energy convert the heat energy into electrical energy?
  
• How far are we away from the sun during the winter compared to the summer?
  
• What is earth's size relative to the galaxy?
  
• What are the sizes of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto?
  
• How do refracting and reflecting telescopes differ?
  
• Question #ec6d0
  
• What are sun and stars made of?
  
• Why did Galileo's observations of Venus help to disprove the geocentric model of the solar system?
  
• What is the circumference of the orbit of earth around sun? Is it different for each year?
  
• What is diurnal rotation of the earth?
  
• How do scientists test the pH of soil?
  
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