Answers edited by chandramohanPanakkal

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