Question

Assertion (A): When we see stars, we are apparently peeping into the past.

Reason (R): What we see today is an object whose emitted light started its journey millions of years back reaching our eyes now.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation for Assertion (A).

• Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation for Assertion (A).

• Assertion (A) is true, but Reason (R) is false.

• Assertion (A) is false, but Reason (R) is true.

Answer 1

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation for Assertion (A).

Explanation:

Light has a finite speed, so the light we now receive from a star left that star some time ago; therefore, observing a star is seeing it as it was when that light was emitted. For very distant stars and galaxies, the time can be millions to billions of years, so the Reason correctly explains the Assertion.