Answers edited by chandramohanPanakkal

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