It would take 100 years for the light from the newborn star to reach Earth.

Here's why:

* Light-year: A light-year is the distance light travels in one year.

* Speed of Light: Light travels at an incredibly fast speed (approximately 186,282 miles per second).

Since the star is 100 light-years away, it means the light from the star has been traveling for 100 years to reach us.