Answers edited by chandramohanPanakkal

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