Answers edited by chandramohanPanakkal

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