Answers edited by chandramohanPanakkal

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