Answers edited by chandramohanPanakkal

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• Why did Galileo's observations of Venus help to disprove the geocentric model of the solar system?
  
• Why does the moon exhibit phases?
  
• How does aneroid barometer works?
  
• How many parsecs are in one mile?
  
• 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 are all the planets relative size compared to earth's size?
  
• How do you calculate the distance between earth and a star?
  
• What are the colors of the stars from hottest to coldest?
  
• What is the circumference of the Earth's orbit around the Sun?
  
• What are the two major forces that act on a star?
  
• Question #5243b
  
• What theory describes the formation of the moon?
  
• What evidence supports theories that water once flowed on Mars?
  
• 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?
  
• What is precession?
  
• Why was Pluto discredited as a planet?
  
• How far are we away from the sun during the winter compared to the summer?
  
• Why can't we get a picture of the lunar rover sitting on the surface of the moon with earth-based telescopes?
  
• How do refracting and reflecting telescopes differ?
  
• 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 moon phases? Why is there only one full moon a month?
  
• Why do the planets all orbit in planes very close to the ecliptic?
  
• How do refracting telescopes work?
  
• Why is the Sun different from other stars in the universe?
  
• Why are the images sent from Mars in black and white rather than color?
  
• At what point does the ecliptic cut the celestial equator?
  
• What enables us to see different stars and constellation during different seasons?
  
• What is the largest man-made satellite orbiting the earth?
  
• How was the size of earth first measured?
  
• How bright is a full moon in comparison to the Sun?
  
• Is a yellow star, such as the sun, hotter or cooler than an orange star?
  
• What are the Jovian planets? Where are they found?
  
• What are sun and stars made of?
  
• What are the sizes of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto?
  
• What is the distance from earth to the sun in light years?
  
• Where did the Apollo Missions land on the moon?
  
• How is electromagnetic radiation produced on the sun?
  
• What is the life cycle of a star?
  
• What are all the planets relative size compared to earth's?
  
• When a comet is at perihelion does it have a brighter tail?
  
• What causes the earth to tilt back and forth to give us the seasons?
  
• How can electric energy be produced?
  
• How does natural gas convert to energy?
  
• How long would it take us to travel to Pluto in years?
  
• When is the tail of a comet the shortest?
  
• How many parsec are in one kilometer?
  
• What is diurnal rotation of the earth?
  
• What is the angle of tilt of the earth with the vertical axis?
  
• How does looking at the sun damage your eye?
  
• What is the primary event that lead to the formation of the moon?
  
• How does an electric motor operate?
  
• Why are astronomical units used?
  
• What does the Hubble Space Telescope do?
  
• How many orbits had the sun completed just after the formation of solar system?
  
• What is earth's size relative to the galaxy?
  
• Do astronomers have satellites orbiting other planets in our solar system?
  
• When and where did Giuseppe Piazzi live and work?
  
• How do scientists test the pH of soil?
  
• Saturn is approximately 1.5 billion kilometers from the sun. What is this distance in AU?
  
• Who was the first person to observe the moon through a telescope? What features of the moon did he identify?
  
• What is the approximate speed at which the earth orbits the sun?
  
• Does the earth spin slower on the northern and southern latitudes ?
  
• What is the size of the Earth's surface?
  
• What are circumpolar stars?
  
• What do stars and planets look like from a telescope? Does their appearance vary depending on the type of telescope used?
  
• What causes a nova explosion?
  
• What is beyond our solar system?
  
• Which planet in our solar system is most earth like?
  
• What planet is closest to the moon in the night sky?
  
• How does the solar system move?
  
• How does solar energy convert the heat energy into electrical energy?
  
• Which way does the moon and earth rotate around the sun?
  
• How do nuclear energy plants work?
  
• How does looking at the sun damage your eye?
  
• Which is the nearest star to the Earth: The Sun or Alpha Centauri?
  
• What are the southern hemisphere constellations?
  
• What are the approximate size differences between the Earth and the Moon?
  
• Do all stars look like our sun?
  
• How is electromagnetic radiation used in communication?
  
• 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?
  
• Who discovered the size of earth?
  
• What is the nearest star to earth?
  
• How does the sun affect our tides?
  
• Question #ec6d0
  
• 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?
  
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