The branch of astronomy that deals with the physics of celestial objects and phenomena.
What is cosmology?
The study of the origin, evolution, and structure of the universe.
What is a star?
A massive, luminous sphere of plasma held together by gravity.
What is a galaxy?
A system of millions or billions of stars, along with gas, dust, and other celestial objects, held together by gravity.
What is dark matter?
A form of matter thought to account for approximately 85% of the matter in the universe, but it does not interact with light or other electromagnetic radiation
What is a black hole?
A region of spacetime exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it.
What is the Big Bang theory?
The prevailing cosmological model that explains the origin and evolution of the universe.
What is the cosmic microwave background radiation?
The electromagnetic radiation left over from the time of the Big Bang.
What is a supernova?
The explosion of a massive star that releases an enormous amount of energy.
What is the Hubble Space Telescope?
A space telescope that was launched into low Earth orbit in 1990 and remains in operation.
What is dark energy?
A hypothetical form of energy that is believed to be responsible for the accelerating expansion of the universe.
What is a pulsar?
A highly magnetized, rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles.
What is the Doppler effect?
The change in frequency or wavelength of a wave for an observer moving relative to its source.
What is the Oort cloud?
A potential source of long-period comets located in the outermost region of the solar system.
What is a quasar?
An extremely luminous active galactic nucleus, typically emitting massive amounts of energy.
What is the study of the origin, evolution, and structure of the universe?
What is a massive, luminous sphere of plasma held together by gravity?
What is the prevailing cosmological model that explains the origin and evolution of the universe?
What is a system of millions or billions of stars, along with gas, dust, and other celestial objects, held together by gravity?
What is a form of matter thought to account for approximately 85% of the matter in the universe, but it does not interact with light or other electromagnetic radiation?
What is a region of spacetime exhibiting gravitational acceleration so strong that nothing can escape from it?
What is the electromagnetic radiation left over from the time of the Big Bang?
What is the explosion of a massive star that releases an enormous amount of energy?
What is a space telescope that was launched into low Earth orbit in 1990 and remains in operation?
What is a hypothetical form of energy that is believed to be responsible for the accelerating expansion of the universe?
What is a highly magnetized, rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles?
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