Since a star's light takes so long to reach us, how do we know that the star is still there?

If it takes thousand of years for light to reach from distance

Does the expansion of the Universe break the speed of light? - Big

Ask Ethan: How Many Stars In The Night Sky Still Exist?

Star - Formation, Evolution, Lifecycle

Home - Ask an Astronomer

Light and Doppler shift

How far back in time can we see?

Home - Ask an Astronomer

ELI5: How far of the universe can we actually 'see'? And how did we discover the ones that we can't. : r/explainlikeimfive

If we only see the stars whose light has travelled to us till now, does that mean the sky will get brighter in the future as more light from other stars will