Respuesta :
Two distant galaxies are receding from earth at 0.75c, in opposite directions with 0.98c fast an observer in one galaxy measure the other to be moving.
u=u'+v/1+uv'/c²
u=0.85c+0.75c/1+0.75*0.85=0.98 c
A galaxy is an enormous collection of gas, dust, billions of stars, and their solar systems all held together by gravity. A planet in our solar system by the name of Earth is where we call home. The Milky Way Galaxy's size is relatively small. A galaxy is a massive cluster of stars and planets that spans many billions of light years. A far-off galaxy has been found by astronomers. the solar system, the nebula, and the star system More Galactic equivalents. Nearly all of the hydrogen and helium in the universe after the Big Bang. Some astronomers believe that gravity caused dust and gas to come together to form individual stars, and that these stars then drew together to form groups that eventually developed into galaxies.
Learn more about galaxy here:
https://brainly.com/question/1446903
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