Answers edited by chandramohanPanakkal

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• What does the Hubble Space Telescope do?
  
• Is a yellow star, such as the sun, hotter or cooler than an orange star?
  
• How does looking at the sun damage your eye?
  
• 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 causes the earth to tilt back and forth to give us the seasons?
  
• What are the two major forces that act on a star?
  
• How do nuclear energy plants work?
  
• At what point does the ecliptic cut the celestial equator?
  
• How many orbits had the sun completed just after the formation of solar system?
  
• Question #5243b
  
• How does the solar system move?
  
• How does an electric motor operate?
  
• What causes a nova explosion?
  
• How does aneroid barometer works?
  
• 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 the primary event that lead to the formation of the moon?
  
• How does looking at the sun damage your eye?
  
• What theory describes the formation of the moon?
  
• Which way does the moon and earth rotate around the sun?
  
• When and where did Giuseppe Piazzi live and work?
  
• Do all stars look like our sun?
  
• How is electromagnetic radiation used in communication?
  
• Who was the first person to observe the moon through a telescope? What features of the moon did he identify?
  
• What is the approximate speed at which the earth orbits the sun?
  
• Why are astronomical units used?
  
• Where did the Apollo Missions land on the moon?
  
• 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?
  
• Question #ec6d0
  
• What is the size of the Earth's surface?
  
• What is the circumference of the Earth's orbit around the Sun?
  
• How can electric energy be produced?
  
• What is the angle of tilt of the earth with the vertical axis?
  
• 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?
  
• When is the tail of a comet the shortest?
  
• What is diurnal rotation of the earth?
  
• What are the southern hemisphere constellations?
  
• What is the largest man-made satellite orbiting the earth?
  
• What is beyond our solar system?
  
• How far are we away from the sun during the winter compared to the summer?
  
• What evidence supports theories that water once flowed on Mars?
  
• Why was Pluto discredited as a planet?
  
• Why do the planets all orbit in planes very close to the ecliptic?
  
• What are circumpolar stars?
  
• How is electromagnetic radiation produced on the sun?
  
• How do refracting and reflecting telescopes differ?
  
• How bright is a full moon in comparison to the Sun?
  
• What is the distance from earth to the sun in light years?
  
• What are the approximate size differences between the Earth and the Moon?
  
• Why does the moon exhibit phases?
  
• Why are the images sent from Mars in black and white rather than color?
  
• Why is the Sun different from other stars in the universe?
  
• How many parsec are in one kilometer?
  
• What do stars and planets look like from a telescope? Does their appearance vary depending on the type of telescope used?
  
• What is the nearest star to earth?
  
• How long would it take us to travel to Pluto in years?
  
• Who discovered the size of earth?
  
• What are all the planets relative size compared to earth's size?
  
• Which is the nearest star to the Earth: The Sun or Alpha Centauri?
  
• How do scientists test the pH of soil?
  
• Does the earth spin slower on the northern and southern latitudes ?
  
• How do refracting telescopes work?
  
• What is the life cycle of a star?
  
• What planet is closest to the moon in the night sky?
  
• Why did Galileo's observations of Venus help to disprove the geocentric model of the solar system?
  
• What causes moon phases? Why is there only one full moon a month?
  
• Which planet in our solar system is most earth like?
  
• What are some similarities and differences between Venus and Earth?
  
• What is earth's size relative to the galaxy?
  
• What are sun and stars made of?
  
• How does natural gas convert to energy?
  
• How many parsecs are in one mile?
  
• How does solar energy convert the heat energy into electrical energy?
  
• What enables us to see different stars and constellation during different seasons?
  
• What are the sizes of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto?
  
• What is the circumference of the orbit of earth around sun? Is it different for each year?
  
• Saturn is approximately 1.5 billion kilometers from the sun. What is this distance in AU?
  
• How was the size of earth first measured?
  
• How do you calculate the distance between earth and a star?
  
• 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 does looking at the sun damage your eye?
  
• When a comet is at perihelion does it have a brighter tail?
  
• What is precession?
  
• What are the Jovian planets? Where are they found?
  
• Do astronomers have satellites orbiting other planets in our solar system?
  
• What are the colors of the stars from hottest to coldest?
  
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