Answers edited by chandramohanPanakkal

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