Answers edited by chandramohanPanakkal

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