Answers edited by chandramohanPanakkal

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