Question

What are so tiny that they are measured at only a few thousand light-years or less and astronomers think that there may be billions of them in our universe?

Answer 1

The correct answer is STARS

Step-by-step explanation:

Billions of stars are believed to be in different galaxies and a lot more billions are believed to be in our universe. These stars are small/tiny that they are a few thousand light-years away. Light-year is the unit for measuring distance of bodies in space which can be described as how far a beam of light travels in a year.