Advertisements
Advertisements
Question
Why do some stars appear blue and some red?
Solution
Stars are the fundamental building blocks of galaxies. Stars were formed when the galaxies were formed during the Big Bang. Stars produce heat, light, ultraviolet rays, x-rays, and other forms of radiation. They are largely composed of gas and plasma (a superheated state of matter).
The brightness of a star depends on their intensity and the distance from the Earth. Stars also appear to be in different colours depending on their temperature. Hot stars are white or blue, whereas cooler stars are orange or red in colour.
APPEARS IN
RELATED QUESTIONS
Do all the stars in the sky move? Explain.
Which of the following figures depicts the position of Pole star correctly?
State whether the following is 'True' or 'False'.
The planets keep changing their position with respect to stars.
State whether the following is 'True' or 'False'.
The planet Venus appears in the eastern sky before sunrise.
A star is 10 light years away from the earth. Suppose it brightens up suddenly today. After how much time shall we see this change?
All planets except mercury in our solar system have Moons.
Name the planets which have more than 60 Moons.
Do stars emit light only during the night?
We can see nearly ______ stars with the naked eye in the dark night.
Stars also appear to be in different colors depending on their composition of Gases.
