Answers edited by chandramohanPanakkal

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