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Would it be technically possible, to build any 'small' space craft that could reach Mars, launching from earth?

The requirement would only be for the craft to make impact with the planet, crashing into it is totally fine. There is no requirement to carry cargo or passengers, or to land/orbit. This is no budget constraint. The challenge is simply to start on the surface of Earth, and end up on Mars. It would be necessary however to verify that the object did indeed reach its target.

If so, what are the limits of 'small'? The size of a car? The size of a cell phone?

What would the main limiting factors be?

As this is a very broad question, I am not looking for specific technical detail, but rather what the general issues/constraints might be.

share|improve this question
    
What are your expectations for it for reaching Mars? Does it need to get into orbit? Does it need to land? This is much too broad. – Phiteros 3 hours ago
    
Ok, thanks, let me edit it down a bit. First question here, wasn't sure how broad I could get with a general interest question. – Ryan27 3 hours ago
    
Well, if you're asking about a lower bound with no specifications, you could technically just launch a sub-atomic particle at Mars using a particle accelerator and call it a spacecraft. – Phiteros 3 hours ago
    
Good point. I will add one more requirement. I'd like to be able to verify that the object reached the planet. – Ryan27 3 hours ago
    
What counts as verification in this case? Does the object have to send a signal to Earth? Does an orbiter have to see it sitting on the surface? Would leaving a crater on Mars after it crashes good enough? – Phiteros 3 hours ago

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