Answers edited by chandramohanPanakkal

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• What are the colors of the stars from hottest to coldest?
  
• What are the two major forces that act on a star?
  
• What are sun and stars made of?
  
• How many orbits had the sun completed just after the formation of solar system?
  
• What is the primary event that lead to the formation of the moon?
  
• How is electromagnetic radiation produced on the sun?
  
• Question #5243b
  
• How do refracting telescopes work?
  
• What is beyond our solar system?
  
• Saturn is approximately 1.5 billion kilometers from the sun. What is this distance in AU?
  
• Why are the images sent from Mars in black and white rather than color?
  
• What is the angle of tilt of the earth with the vertical axis?
  
• Where did the Apollo Missions land on the moon?
  
• How far are we away from the sun during the winter compared to the summer?
  
• 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 largest man-made satellite orbiting the earth?
  
• What are the Jovian planets? Where are they found?
  
• What is the size of the Earth's surface?
  
• How does the sun affect our tides?
  
• Is a yellow star, such as the sun, hotter or cooler than an orange star?
  
• What are the southern hemisphere constellations?
  
• Why was Pluto discredited as a planet?
  
• How does natural gas convert to energy?
  
• What is the life cycle of a star?
  
• What is the circumference of the Earth's orbit around the Sun?
  
• How do you calculate the distance between earth and a star?
  
• What do stars and planets look like from a telescope? Does their appearance vary depending on the type of telescope used?
  
• When a comet is at perihelion does it have a brighter tail?
  
• Does the earth spin slower on the northern and southern latitudes ?
  
• 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 does the Hubble Space Telescope do?
  
• What is diurnal rotation of the earth?
  
• Why does the moon exhibit phases?
  
• What are all the planets relative size compared to earth's size?
  
• What is earth's size relative to the galaxy?
  
• When is the tail of a comet the shortest?
  
• How can electric energy be produced?
  
• What is precession?
  
• Who discovered the size of earth?
  
• How does looking at the sun damage your eye?
  
• What are circumpolar stars?
  
• Do astronomers have satellites orbiting other planets in our solar system?
  
• How does solar energy convert the heat energy into electrical energy?
  
• How does looking at the sun damage your eye?
  
• What enables us to see different stars and constellation during different seasons?
  
• What are some similarities and differences between Venus and Earth?
  
• What is the circumference of the orbit of earth around sun? Is it different for each year?
  
• How long would it take us to travel to Pluto in years?
  
• What causes a nova explosion?
  
• How many parsecs are in one mile?
  
• What are all the planets relative size compared to earth's?
  
• How does aneroid barometer works?
  
• How does looking at the sun damage your eye?
  
• How does an electric motor operate?
  
• 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?
  
• How was the size of earth first measured?
  
• Do all stars look like our sun?
  
• Why do the planets all orbit in planes very close to the ecliptic?
  
• How many parsec are in one kilometer?
  
• Question #ec6d0
  
• What is the distance from earth to the sun in light years?
  
• What are the sizes of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto?
  
• How does the solar system move?
  
• Which way does the moon and earth rotate around the sun?
  
• How do refracting and reflecting telescopes differ?
  
• How is electromagnetic radiation used in communication?
  
• How do nuclear energy plants work?
  
• What theory describes the formation of the moon?
  
• Why are astronomical units used?
  
• How bright is a full moon in comparison to the Sun?
  
• What are the approximate size differences between the Earth and the Moon?
  
• At what point does the ecliptic cut the celestial equator?
  
• What is the approximate speed at which the earth orbits the sun?
  
• What planet is closest to the moon in the night sky?
  
• When and where did Giuseppe Piazzi live and work?
  
• What is the nearest star to earth?
  
• What causes the earth to tilt back and forth to give us the seasons?
  
• What evidence supports theories that water once flowed on Mars?
  
• 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?
  
• Who was the first person to observe the moon through a telescope? What features of the moon did he identify?
  
• How do scientists test the pH of soil?
  
• Where are the cepheid variables? Can we see any from earth without a telescope?
  
• Which is the nearest star to the Earth: The Sun or Alpha Centauri?
  
• What causes moon phases? Why is there only one full moon a month?
  
• Why did Galileo's observations of Venus help to disprove the geocentric model of the solar system?
  
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