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