Science MCQs

Astronomy is the study of celestial objects and phenomena.

The Big Bang Theory states the universe began from a giant explosion.

George Lemaître a Belgian priest first proposed the theory.

Hubble found galaxies are receding indicating an expanding universe.

They discovered the cosmic microwave background radiation a key evidence for the Big Bang.

A star is a massive ball of glowing plasma held together by gravity.

The Sun is the closest star to Earth.

Hotter stars appear blue cooler stars appear red.

The Sun appears yellow from Earth due to its surface temperature of about 6000 centigrade and atmospheric scattering, but its true color is white. While the Sun radiates all colors of the visible spectrum, it emits most strongly in the yellow part of the spectrum, and the blue wavelengths are scattered away by Earth's atmosphere, making it look more yellow to us. In space, the Sun appears white. 

A light-year is a unit of distance not time.