Answers edited by chandramohanPanakkal

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