Answers edited by chandramohanPanakkal

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