Answers edited by chandramohanPanakkal

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