This is huge. If microscopic alien life has developed on Mars, that's a huge deal. Water definitely proved it may still be there.

I couldn't not post this, I'm sorry :(

Exciting stuff for me, but I love space exploration and discovering new knowledge for the sake of it. I admire humanity in these instances.

I swear we already knew this... I remember watching a documentary years ago talking about how they thought there was underwater streams and how they found dried up riverbeds that seemed new

With our current understanding of life, yes.  But...that's Earth based lifeforms, it also ignores microbial life, which has proven tolerances to extremes far far beyond any environments on Earth.  That's why NASA is being careful not to go near any areas of Mars that could be potentially impacted by microbes/bacteria that cannot be completely wiped off objects we send to other planets.

They had images that suggested 'some' liquid was flowing on Mars, but they couldn't say for certain that's what it was.  With MRO paying attention from orbit for long periods, using spectral analysis to validate what was exactly flowing, they can now say for certain.

Good time to colonize it by colonists

In 5bn years humans will not be humans anymore. The sun would be a Giant and thus the earth would not be there as the sun would occupy that space. Neptune and Pluto would have collided along with other objects colliding, possibly the earth and a comet. In fact in just 1bn years the earth would not be habitable.

Cool, humanity is less doomed now

I think by the time the earth blows up the moon would be captured by the sun and become another planet.