Answers edited by chandramohanPanakkal

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• 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?
  
• How do you calculate the distance between earth and a star?
  
• How is electromagnetic radiation used in communication?
  
• What is the distance from earth to the sun in light years?
  
• How does natural gas convert to energy?
  
• Why do the planets all orbit in planes very close to the ecliptic?
  
• Where did the Apollo Missions land on the moon?
  
• How can electric energy be produced?
  
• What is the size of the Earth's surface?
  
• What are all the planets relative size compared to earth's size?
  
• What are the colors of the stars from hottest to coldest?
  
• Why can't we get a picture of the lunar rover sitting on the surface of the moon with earth-based telescopes?
  
• What are the approximate size differences between the Earth and the Moon?
  
• How does looking at the sun damage your eye?
  
• When is the tail of a comet the shortest?
  
• What does the Hubble Space Telescope do?
  
• How is electromagnetic radiation produced on the sun?
  
• What evidence supports theories that water once flowed on Mars?
  
• Why are astronomical units used?
  
• Which planet in our solar system is most earth like?
  
• Question #ec6d0
  
• What is precession?
  
• Why are the images sent from Mars in black and white rather than color?
  
• 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 was the size of earth first measured?
  
• How does an electric motor operate?
  
• How does looking at the sun damage your eye?
  
• How does the sun affect our tides?
  
• How many parsec are in one kilometer?
  
• What is the circumference of the Earth's orbit around the Sun?
  
• How far are we away from the sun during the winter compared to the summer?
  
• Why does the moon exhibit phases?
  
• How bright is a full moon in comparison to the Sun?
  
• What causes the earth to tilt back and forth to give us the seasons?
  
• How many parsecs are in one mile?
  
• What is diurnal rotation of the earth?
  
• Does the earth spin slower on the northern and southern latitudes ?
  
• How does aneroid barometer works?
  
• At what point does the ecliptic cut the celestial equator?
  
• What is the primary event that lead to the formation of the moon?
  
• What is the angle of tilt of the earth with the vertical axis?
  
• What planet is closest to the moon in the night sky?
  
• Do all stars look like our sun?
  
• What are the southern hemisphere constellations?
  
• How do nuclear energy plants work?
  
• Who discovered the size of earth?
  
• Do astronomers have satellites orbiting other planets in our solar system?
  
• What are the sizes of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto?
  
• What enables us to see different stars and constellation during different seasons?
  
• Question #5243b
  
• What is the life cycle of a star?
  
• Who was the first person to observe the moon through a telescope? What features of the moon did he identify?
  
• What are some similarities and differences between Venus and Earth?
  
• Why is the Sun different from other stars in the universe?
  
• 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?
  
• 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?
  
• What are sun and stars made of?
  
• Is a yellow star, such as the sun, hotter or cooler than an orange star?
  
• What theory describes the formation of the moon?
  
• What are the Jovian planets? Where are they found?
  
• Saturn is approximately 1.5 billion kilometers from the sun. What is this distance in AU?
  
• What is the nearest star to earth?
  
• What is earth's size relative to the galaxy?
  
• What do stars and planets look like from a telescope? Does their appearance vary depending on the type of telescope used?
  
• Which way does the moon and earth rotate around the sun?
  
• What is the circumference of the orbit of earth around sun? Is it different for each year?
  
• What is the largest man-made satellite orbiting the earth?
  
• Why was Pluto discredited as a planet?
  
• How do scientists test the pH of soil?
  
• How do refracting telescopes work?
  
• When a comet is at perihelion does it have a brighter tail?
  
• What causes a nova explosion?
  
• Why did Galileo's observations of Venus help to disprove the geocentric model of the solar system?
  
• What is the approximate speed at which the earth orbits the sun?
  
• What is beyond our solar system?
  
• How does the solar system move?
  
• What are circumpolar stars?
  
• When and where did Giuseppe Piazzi live and work?
  
• How long would it take us to travel to Pluto in years?
  
• How do refracting and reflecting telescopes differ?
  
• How does solar energy convert the heat energy into electrical energy?
  
• What causes moon phases? Why is there only one full moon a month?
  
• What are the two major forces that act on a star?
  
• How does looking at the sun damage your eye?
  
• What are all the planets relative size compared to earth's?
  
• Which is the nearest star to the Earth: The Sun or Alpha Centauri?
  
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