Answers edited by chandramohanPanakkal

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