Answers edited by chandramohanPanakkal

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