What are 5 advantages and 5 disadvanteges for space travel?

What are 5 things that the human race can benefit from space travel?? What are 5 disadvanteges from space travel?

This is just in a modern rocket nothing we haven't invented
Advantages:
Explore new planets see how they formed and compare to our planet
possibly discover new cures for diseases
Learn how universe formed and where we came from
Maybe eventually look to see if space is a better place for humans to live
Defiantly new technology's would arise from space travel and the off off chance of seeing new life

Disadvantages:
The program is very expensive and could be spent helping starving and homeless families
It is dangerous to crew and very unreliable
The emission from he rocket is a pollutant and harms the enviorment
Most tecnology hasnt benifited the average family and is a waste of reasources
We dont really know what we are doing to the moon and possibly other planets if we can reach them and might harm them.

Advantages
1) improved scientific and technical knowledge--which has historically proven to more than pay for space programs.
2) Weather satellites
3) communications satellites
4) insurance against an asteroid/comet hitting earth--which is not a sci-fi scenario--the last hit was in 1906--fortunately in an uninhabited area of Siberia
5) When--not if--we start orbital manufacturing, it will make our lives better with new medicines, thechnologies, etc.

Disadvantages:

Its expensive to do the research--but so is any valuable new technology.
Other disadvantages: none.

An example of the so-called "costs" o fspace travel was posted by anonter answerer: the money could be used to feed starving people. We have plenty of food on earth--if you want poor people to get it, fix the political system, dont blame NASA.

Or would this lamebrain like allthose poor people she PRETENDS to care about to do without the weather forcasts that help save lives--and increase crop production? Or the solar panels developed by NASA that are bringing electricity to people in Africa for the first time.

Sorry for the rant--but I get sick of the fake "humanitarians" who think whining is a substitute for learning and working to improve things.