Answers edited by chandramohanPanakkal

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