Answers edited by Phillip E.

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• What fusion reactions other than Hydrogen are important in stars?
  
• How long does it take for the earth to rotate on its axis?
  
• Once a photon of light is generated, how long does it take to escape beyond the outer part of the Sun?
  
• How many AU are between the Sun and Pluto?
  
• How do you solve #(2x)/(x-4)=8/(x-4)+3#?
  
• Do astronauts age while traveling in space?
  
• A star has an apparent magnitude of 10 and an absolute magnitude of -5. How far away is it?
  
• How long will it take Voyager 1 to reach another solar system?
  
• How many different type eclipse are there?
  
• What is nuclear fission?
  
• What is a quasar?
  
• What defines a planet's orbit?
  
• What are the moons of inner planets?
  
• If an object is mass m with a velocity u collides with a stationary object of mass m, how much kinetic energy is lost?
  
• Do gravitational fields have negative energy?
  
• Why are uranus and Neptune called the ice giant planets?
  
• What determines the orbital period of a satellite?
  
• What is the space time fabric made up of?
  
• What are the chances that life exists on other planets?
  
• What is the hottest temperature the universe has ever been?
  
• How was the solar system formed?
  
• During the fusion process, how is mass converted into energy?
  
• What are blue stragglers and how are they detected?
  
• In a nuclear reaction, is mass lost to produce energy?
  
• Does light frequency change?
  
• Does a star's mass determine when fusion reactions start?
  
• Why February has only 28 days?
  
• Why the speed of light is constant in every reference point?Train going with a speed of 200m/sec emitting light from the front of it,then there the speed of light would be 300000200m/sec but there also the speed of light is constant (300000000m/sec)
  
• Is time travel possible?
  
• When do solar and lunar eclipses occur?
  
• According to the Big Bang theory, our universe started out as a singularity. In what did the singularity exist if nothing existed prior to the Big Bang?
  
• How long does it take most massive stars end their life?
  
• What would happen if a gamma ray burst hit the Earth?
  
• Which produces more energy, nuclear fusion or nuclear fission?
  
• Why are light years used to measure distances in space?
  
• Where is the solar system could life exist other than on Earth?
  
• Estimate the approximate (minimum) mass of an exoplanet in a 3.312 day orbit around a 1.3 solar-mass star, where it is known that the radial velocity caused by orbital motion is 471 metres per second?
  
• Thoughts on the recent announcement made about the future of the Socratic website? Share them here!
  
• What causes a supernova?
  
• If the radius of the earth’s orbit around the sun is 150 million kilometers, what is the speed of the earth in its orbit in kilometers per hour ?
  
• Who's interested in a new Socratic on a different website?
  
• In a star if helium fuses to make carbon, what makes the elements in between?
  
• Can a planet two, three, or even ten times the size of earth have the same gravity?
  
• What is black hole in-universe?
  
• How do astronomers measure the mass of a supermassive black hole?
  
• What is the core of the Earth made of?
  
• What was the first continent on earth?
  
• Do the other planets have atmospheres and are they different to Earth's?
  
• How do stars evolve from their birth to their death?
  
• What are the factors for #a^6 + 7a^3 + 6#?
  
• What is the frequency/wavelength of a neutrino?
  
• Any reasonable theory for creation of dark matter to creation of big bang and also write the relation between dark matter and dark energy???
  
• How do you factor #x^6 + 8#?
  
• What is the distance of pluto from earth?
  
• What angles do comets orbits make to the Earth's orbit and from what directions do they approach the Sun?
  
• What is a parsec?
  
• What is the difference between a meson and a boson?
  
• Does gravity have a long range?
  
• What is antimatter, and what are some of it's properties?
  
• What does LC mean?
  
• What is the length of a day?
  
• How do you factor by grouping #3ab - b - 4 + 12a#?
  
• How do you specify the size of a planet?
  
• When will the last total solar eclipse occur?
  
• When can nuclear fusion and nuclear fission reactions take place?
  
• Is evaporating water is a chemical changes?
  
• What is Newton's constant G?
  
• What are the elementary particles of nuclear physics?
  
• What is Newton's third law?
  
• Is the sun directly in the center of earth's orbit?
  
• What is the difference between the strong and weak nuclear forces of the universe?
  
• Is Astrology a science?
  
• Can you orbit the event horizon of a black hole?
  
• How are heavy elements formed?
  
• What do phobos and deimos mean?
  
• A stone is thrown vertically upwards and it reaches a maximum height of 30m. What was its initial velocity?
  
• Are red giants smaller than when they were main sequence stars?
  
• What is the mass difference of an atomic nucleus?
  
• Imagine a place where gravity is slower than on earth,there 1 second is equal to 10 seconds on earth.There, will light cover more distance than that on earth in 1 second? How will you measure its speed?
  
• If an asteroid is heading towards the Earth from behind the Sun, will we be able to detect it?
  
• How were wormholes discovered?
  
• Thoughts on the recent announcement made about the future of the Socratic website? Share them here!
  
• If the Earth's axis of rotation was inclined at 90 degrees what would happen?
  
• How big is the biggest asteroid? How bit is it compared to our moon?
  
• What evidence is there that the Universe is expanding?
  
• Do the planets orbit the sun on a 2-D plane?
  
• How is a comet different from a meteor?
  
• How many neutrinos are in the universe?