By measuring the dip in star's brightness we can determine a planet's mass

density radius and also its distance from the star. Soon we will be able to

determine if there is oxygen in the atmosphere.


So we are finding many planets that probably have life as we know it--when we

find oxygen there we will know for sure. Scientists already know we are not

alone in the universe.

No such thing has definitively been determined, but likely, yes.

So lots of life likely, even intelligent life, yet no visits from any,
and very likely never will be. Distances between stars is far too
great.