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