Answers edited by chandramohanPanakkal

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