Answers edited by chandramohanPanakkal

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