Answers edited by chandramohanPanakkal

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