Can we make it to Mars ?

Mission to Mars has many challenges;

1. Meteoroids that can damage spaceship
2. Zero gravity that will weaken the muscles of astronauts 
3. Cosmic rays that can damage a spaceship and a human body 
4. Carrying sufficient food for 2+ years and preserving the same for that long
5. Amount of fuel required to to propel spaceship

Watch this great video that walks through all these challenges in depth in an interesting way