Answers edited by chandramohanPanakkal

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