Answers edited by chandramohanPanakkal

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