Answers edited by chandramohanPanakkal

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