If you send robots into space, you will not risk a human life, only an artificial creation. Robots can explore space more widely , not hampered by the lack of oxygen. If it is an advanced robot, it will have cameras and maybe increaced eyesight.They can rove the surface of uninhabitable planets like Mars or Mercury.
The advantage is if they get lost in space, you can track them , unlike a human in space. A human in space would be untrackable, unless they had a tracking device in suit. The tracker could be dislodged on some space gear but on a robot, it would be an inbuilt piece of technoligy . Robots would also be able to build a house or if there were enough and the time called for it, they could build a city.
Humans would expend lots of resorces but overall, it would be worth it , as Robots would be worth it. You could also get the robots to multi-task or help engineering dangerous things.They can do space work without the risk of a damaged suit and with a lesser risk of a damaged body, as they are constructed from metal and plastic.
A fleet of made of a few thousand robots would be demanding, resource-wise, and would use up billions of pounds, dollars or euros.They would make up for it, being able to mine crystals or metals on other planets or finding a safe place to settle in an alternate planet like neptune, witch is a large planet covered in ice. There are chances of creatures there so that proves its liveable. So the question is: how can we settle on a planet that is not our Earth?