Answers edited by chandramohanPanakkal

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