Answers edited by chandramohanPanakkal

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