Science Questions
Explore questions in the Science category that you can ask Spark.E!
Which of these objects has the largest radius?a 1.2MSunwhite dwarfa 1.5MSun neutron stara 3.0MSun black hole
Which statement about pulsars is not thought to be true?All pulsars are neutron stars, but not all neutron stars are pulsars.A pulsar must have a strong magnetic field and rotate quite rapidly.Pulsars are kept from collapsing by neutron degeneracy pressure.Pulsars can form only in close binary systems.
Which of the following statements about gamma ray bursts is not true?The events responsible for gamma ray bursts apparently produce only gamma rays, and no other light that we can hope to detect.Many gamma ray bursts are associated with supernovas in distant galaxies.Gamma ray bursts are among the most luminous events that ever occur in the universe.Gamma ray bursts were originally discovered by satellites designed to look for signs of nuclear bomb tests on Earth.
No visible light can escape a black hole, but things such as gamma rays, X rays, and neutrinos can.
Which of the following statements about degeneracy pressure is not true?Degeneracy pressure arises from a quantum mechanical effect that we don't notice in our daily lives.Degeneracy pressure can continue to support an object against gravitational collapse even if the object becomes extremely cold.Degeneracy pressure can arise only from interactions among electrons.Black holes form when gravity overcomes neutron degeneracy pressure.
Will our Sun ever undergo a white dwarf supernova explosion? Why or why not?
Which of the following observatories is most likely to discover a black hole in a binary system?
The white dwarf that remains when our Sun dies will be mostly made of ______.
When we see X rays from an accretion disk in a binary system, we can't immediately tell whether the accretion disk surrounds a neutron star or a black hole. Suppose we then observe each of the following phenomena in this system. Which one would force us to immediately rule out the possibility of a black hole?
Which statement about accretion disks is not true?Accretion disks are made primarily of hydrogen and helium gas.The primary factor determining whether a white dwarf has an accretion disk is the white dwarf's mass.The gas in the inner parts of the disk is hotter than the gas in the outer parts of the disk.The gas in the inner parts of the disk travels faster than the gas in the outer parts of the disk.
A teaspoonful of white dwarf material on Earth would weigh
All pulsars are neutron stars, but not all neutron stars are pulsars.
Which of the following is closest in size (radius) to a neutron star?
What would happen if the Sun suddenly became a black hole without changing its mass?
Which of the following is closest in mass to a white dwarf?
Degeneracy pressure is the source of the pressure that stops the crush of gravity in all the following except1
The Schwarzschild radius of a black hole depends on ________.
Based on current evidence, which of the following statements about gamma ray bursts is true?
Which of these neutron stars must have had its angular momentum changed by a binary companion?
At what point of a planet's orbit does it move the fastest?