Answers edited by chandramohanPanakkal

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