Answers edited by chandramohanPanakkal

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