Answers edited by chandramohanPanakkal

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