lorrin mike PHYSICS   -   Astrophysics

What is the predominant element found in the universe by mass fraction?

Hydrogen is the most abundant element in the universe by mass fraction, constituting about 75% of the mass of all normal matter.
lorrin mike PHYSICS   -   Astrophysics

Which phenomenon describes the bending of light around a massive object due to gravity?

Gravitational lensing occurs when light from a distant object is bent as it passes near a massive object, like a galaxy or a black hole, due to the gravitational field of the massive object.
lorrin mike PHYSICS   -   Astrophysics

What theoretical concept describes the gravitational collapse of a massive star into an infinitely dense point, resulting in a gravitational singularity?

A black hole is a region of spacetime where gravity is so intense that not even light can escape from it, formed by the collapse of a massive star.
lorrin mike PHYSICS   -   Astrophysics

What is the primary source of energy generation in main-sequence stars like the Sun?

Main-sequence stars like the Sun generate energy through nuclear fusion, specifically the fusion of hydrogen into helium in their cores.
lorrin mike PHYSICS   -   Astrophysics

Which type of galaxy is characterized by a flat disk containing young stars, gas, and dust, with spiral arms extending outward from a central bulge?

Spiral galaxies have a distinct flattened disk structure with spiral arms emanating from a central bulge, containing young stars, gas, and dust.
lorrin mike PHYSICS   -   Astrophysics

What is the name of the boundary surrounding a black hole beyond which nothing, not even light, can escape?

The event horizon is the boundary surrounding a black hole from within which nothing can escape its gravitational pull, not even light.
lorrin mike PHYSICS   -   Astrophysics

Which of the following is a remnant of a massive star that has undergone a supernova explosion?

A neutron star is the compact remnant left behind after a massive star explodes in a supernova.
lorrin mike PHYSICS   -   Astrophysics

What phenomenon causes the shift in spectral lines towards longer wavelengths in astrophysical objects moving away from Earth?

The Doppler effect causes the shift in spectral lines towards longer wavelengths (redshift) for objects moving away from Earth and towards shorter wavelengths (blueshift) for objects moving towards Earth.
lorrin mike PHYSICS   -   Astrophysics

What is the approximate surface temperature of the Sun?

The surface temperature of the Sun is approximately 5,500 degrees Kelvin (K).
lorrin mike PHYSICS   -   Astrophysics

Which of the following types of electromagnetic radiation has the shortest wavelength?

Gamma rays have the shortest wavelength among the options listed. They are high-energy photons with wavelengths shorter than X-rays.

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