Question

Which of the following best describes dark matter?

Select one:

A. Matter made of anti-matter whose effect cancels out the gravity of ordinary matter.

B. Matter that disappears into black holes.

C. Matter that radiates only in the infrared wavelength and has other aspects which make it interesting in some way that will make this the longest answer choice possible for this question.

D. Matter that radiates at radio wavelengths and is thus invisible in ordinary light.

E. Mass deduced to be present from its gravitational effect but which emits no visible light or other detectable radiation.

Answer 1

Answer- Option E

Explanation- Dark matter is introduced to explain galaxy rotational curve. Visible matter (bayonic in nature) is not sufficient to supply gravitational force to explain this rotational curve. Hence scientist believe there is something (dark matter- still unknown, no radiation or interaction whith normal matter) which is producing this gravitational force to explain rotational curve of galaxy.

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