Answers edited by chandramohanPanakkal

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• What are circumpolar stars?
  
• What causes the earth to tilt back and forth to give us the seasons?
  
• How bright is a full moon in comparison to the Sun?
  
• What is the angle of tilt of the earth with the vertical axis?
  
• How many parsecs are in one mile?
  
• What enables us to see different stars and constellation during different seasons?
  
• What is the approximate speed at which the earth orbits the sun?
  
• What causes moon phases? Why is there only one full moon a month?
  
• What is the size of the Earth's surface?
  
• Which is the nearest star to the Earth: The Sun or Alpha Centauri?
  
• How does an electric motor operate?
  
• How does the sun affect our tides?
  
• What is the distance from earth to the sun in light years?
  
• How can electric energy be produced?
  
• What are the two major forces that act on a star?
  
• What is beyond our solar system?
  
• Do astronomers have satellites orbiting other planets in our solar system?
  
• What is the life cycle of a star?
  
• Why did Galileo's observations of Venus help to disprove the geocentric model of the solar system?
  
• What are the Jovian planets? Where are they found?
  
• Why are the images sent from Mars in black and white rather than color?
  
• Question #5243b
  
• What are all the planets relative size compared to earth's size?
  
• What is diurnal rotation of the earth?
  
• What do stars and planets look like from a telescope? Does their appearance vary depending on the type of telescope used?
  
• Why do the planets all orbit in planes very close to the ecliptic?
  
• Who was the first person to observe the moon through a telescope? What features of the moon did he identify?
  
• What is the primary event that lead to the formation of the moon?
  
• What theory describes the formation of the moon?
  
• Is a yellow star, such as the sun, hotter or cooler than an orange star?
  
• Why does the moon exhibit phases?
  
• How do scientists test the pH of soil?
  
• What is the largest man-made satellite orbiting the earth?
  
• How does looking at the sun damage your eye?
  
• What are the sizes of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto?
  
• What is precession?
  
• How do refracting telescopes work?
  
• Where are the cepheid variables? Can we see any from earth without a telescope?
  
• How does looking at the sun damage your eye?
  
• What is earth's size relative to the galaxy?
  
• How many parsec are in one kilometer?
  
• 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 do you calculate the distance between earth and a star?
  
• How does natural gas convert to energy?
  
• How was the size of earth first measured?
  
• How do refracting and reflecting telescopes differ?
  
• How does looking at the sun damage your eye?
  
• How does the solar system move?
  
• What are some similarities and differences between Venus and Earth?
  
• Who discovered the size of earth?
  
• How is electromagnetic radiation produced on the sun?
  
• Saturn is approximately 1.5 billion kilometers from the sun. What is this distance in AU?
  
• How do nuclear energy plants work?
  
• Does the earth spin slower on the northern and southern latitudes ?
  
• At what point does the ecliptic cut the celestial equator?
  
• How far are we away from the sun during the winter compared to the summer?
  
• What are all the planets relative size compared to earth's?
  
• What planet is closest to the moon in the night sky?
  
• How long would it take us to travel to Pluto in years?
  
• 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?
  
• Which way does the moon and earth rotate around the sun?
  
• When is the tail of a comet the shortest?
  
• What does the Hubble Space Telescope do?
  
• What evidence supports theories that water once flowed on Mars?
  
• How does aneroid barometer works?
  
• How is electromagnetic radiation used in communication?
  
• When a comet is at perihelion does it have a brighter tail?
  
• How many orbits had the sun completed just after the formation of solar system?
  
• What are the approximate size differences between the Earth and the Moon?
  
• What are sun and stars made of?
  
• What is the nearest star to earth?
  
• What is the circumference of the Earth's orbit around the Sun?
  
• What is the circumference of the orbit of earth around sun? Is it different for each year?
  
• Do all stars look like our sun?
  
• Which planet in our solar system is most earth like?
  
• Why is the Sun different from other stars in the universe?
  
• What are the southern hemisphere constellations?
  
• How does solar energy convert the heat energy into electrical energy?
  
• 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?
  
• When and where did Giuseppe Piazzi live and work?
  
• 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?
  
• Question #ec6d0
  
• What causes a nova explosion?
  
• Where did the Apollo Missions land on the moon?
  
• What are the colors of the stars from hottest to coldest?
  
• Why are astronomical units used?
  
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