Answers edited by chandramohanPanakkal

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