Answers edited by chandramohanPanakkal

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