Answers edited by chandramohanPanakkal

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