Answers edited by chandramohanPanakkal

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