Fill in the blank:

_________is the biggest star of the night sky.

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Alpha Persei

Sirius

Pole Star

Vega

answer is B.

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Detailed Solution

Concept- To determine a star's luminosity or brightness, one must first determine the star's mass. When watching from Earth, the huge star would be the brightest of these stars, and the star's position affects how bright it appears.
According to NASA research, Sirius has a mass twice as great as the Sun's. Sirius would be brighter when compared to the Sun. In Greek, the name Sirius denotes "glowing." Sirius A is another name for Sirius. This star is 8.6 light years from Earth, which is quite nearly close by.
The star can be seen with the naked eye. Its brilliance in comparison to other stars is the reason. Sirius is a member of the Greater Dog constellation, Canis Major. When Sirius shines in the low sky, observers can see the white starlight's flashing colours. Because Sirius is brighter than other stars, this is the case. When Sirius is visible in the high sky, there is less flashing and less colour. The Earth's atmosphere is denser near the horizon. So, it appears to be a prism. While travelling through the atmosphere of the Earth, starlight fragments into different colours.
Hence, option 2 is correct.

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