Answers edited by chandramohanPanakkal

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