Answers edited by chandramohanPanakkal

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• What are some similarities and differences between Venus and Earth?
  
• What theory describes the formation of the moon?
  
• What is the distance from earth to the sun in light years?
  
• Question #5243b
  
• How does the solar system move?
  
• What are circumpolar stars?
  
• Saturn is approximately 1.5 billion kilometers from the sun. What is this distance in AU?
  
• What are the colors of the stars from hottest to coldest?
  
• When is the tail of a comet the shortest?
  
• What is the primary event that lead to the formation of the moon?
  
• Why can't we get a picture of the lunar rover sitting on the surface of the moon with earth-based telescopes?
  
• How long would it take us to travel to Pluto in years?
  
• What evidence supports theories that water once flowed on Mars?
  
• What are all the planets relative size compared to earth's size?
  
• Why is the Sun different from other stars in the universe?
  
• What do stars and planets look like from a telescope? Does their appearance vary depending on the type of telescope used?
  
• How does looking at the sun damage your eye?
  
• How do refracting telescopes work?
  
• Why are astronomical units used?
  
• How does natural gas convert to energy?
  
• At what point does the ecliptic cut the celestial equator?
  
• When and where did Giuseppe Piazzi live and work?
  
• What causes the earth to tilt back and forth to give us the seasons?
  
• Do all stars look like our sun?
  
• How does the sun affect our tides?
  
• What are the approximate size differences between the Earth and the Moon?
  
• What is diurnal rotation of the earth?
  
• How do refracting and reflecting telescopes differ?
  
• What does the Hubble Space Telescope do?
  
• How was the size of earth first measured?
  
• What planet is closest to the moon in the night sky?
  
• How do scientists test the pH of soil?
  
• How far are we away from the sun during the winter compared to the summer?
  
• How does looking at the sun damage your eye?
  
• How does solar energy convert the heat energy into electrical energy?
  
• Do astronomers have satellites orbiting other planets in our solar system?
  
• Why does the moon exhibit phases?
  
• What are the two major forces that act on a star?
  
• How many parsecs are in one mile?
  
• Where did the Apollo Missions land on the moon?
  
• Why was Pluto discredited as a planet?
  
• What are the sizes of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto?
  
• Why do the planets all orbit in planes very close to the ecliptic?
  
• Which way does the moon and earth rotate around the sun?
  
• Is a yellow star, such as the sun, hotter or cooler than an orange star?
  
• When a comet is at perihelion does it have a brighter tail?
  
• What are all the planets relative size compared to earth's?
  
• What causes a nova explosion?
  
• 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?
  
• 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 beyond our solar system?
  
• How can electric energy be produced?
  
• How do you calculate the distance between earth and a star?
  
• Why are the images sent from Mars in black and white rather than color?
  
• Does the earth spin slower on the northern and southern latitudes ?
  
• Why did Galileo's observations of Venus help to disprove the geocentric model of the solar system?
  
• What is the circumference of the orbit of earth around sun? Is it different for each year?
  
• Who was the first person to observe the moon through a telescope? What features of the moon did he identify?
  
• Which is the nearest star to the Earth: The Sun or Alpha Centauri?
  
• What are the southern hemisphere constellations?
  
• 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 are sun and stars made of?
  
• What causes moon phases? Why is there only one full moon a month?
  
• How many parsec are in one kilometer?
  
• What is precession?
  
• What is the angle of tilt of the earth with the vertical axis?
  
• How does aneroid barometer works?
  
• What is the size of the Earth's surface?
  
• What is the approximate speed at which the earth orbits the sun?
  
• How is electromagnetic radiation used in communication?
  
• Who discovered the size of earth?
  
• How many orbits had the sun completed just after the formation of solar system?
  
• What are the Jovian planets? Where are they found?
  
• 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 does looking at the sun damage your eye?
  
• What enables us to see different stars and constellation during different seasons?
  
• How does an electric motor operate?
  
• What is the nearest star to earth?
  
• What is earth's size relative to the galaxy?
  
• What is the circumference of the Earth's orbit around the Sun?
  
• How is electromagnetic radiation produced on the sun?
  
• What is the life cycle of a star?
  
• What is the largest man-made satellite orbiting the earth?
  
• Question #ec6d0
  
• How bright is a full moon in comparison to the Sun?
  
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