Galaxies and superclusters of galaxies are getting further and further apart fro

Question

Galaxies and superclusters of galaxies are getting further and further apart from each other doing. How is this occurring? A or B? A. They are flying apart each other space (or*spacetime*) B. Space between them (or * spacetime*) is stretching, making them further apart from each other. What objects looked mostly like starts when first discovered, but turned out to be much further away and trillions of times brighter than stars? A. Active galaxies B. Black holes C. Quasars D. Elliptical galaxies E. Pulsars

Explanation / Answer

question 7 : ans (B)

it is related to dark mattr and dark energy. as spaces move away from galaxy , it become more decompressed.so, he space between the galaxy expands.

question 8: ans (c)

active galaxy's are the galaxy that has a compact region at the center having much higher luminosity and this luminosity is not producd by stars. thhese non stellar emission are observed in uv, radio, microwave , infrared , x ray region bt not in visible region.

black hole is the region of space in whcih matter is so compact that nothing can escape from it.black holes are formed when a mssive star dies.

elliptical galaxy are the galaxy having an approximately ellipsoial shape and a smooth nearly featureless brightnes profile. they are composed of low mass stars.

pulsars are the dead neutron star that are rotating and have electromagneti radiation.

quasars are very bright point like object just like stars and radiates eneromus amount of energy.they are trillions time brighter than sun (which is a star)

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