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No you can't. If you could build a craft that could travel at or near the speed of light you just can't just ‘’hit the brakes’’ like it was a car. If you did you'd be a smear on the inside wall/bulkhead or what ever of your ship. And besides, as yet we humans do not posses the knowledge, that is to say, the math to make the material to build a craft, or the math and the fuel or energy to create a propulsion system to power such a craft. And even if we did, by the laws of psychics known to us and the distances between star systems, let alone galaxies, even if we could create all this science and technology and build a spaceship, if you will, because a single light year, the distance light travels in a vacuum in one year(i.e one light year= 6 trillion miles) by the time you'd gone even a quarter of that distance, an 1/8 of that distance really, everything and everyone you left behind on Earth will be long gone.

“If you could build a craft that could travel at or near the speed of light you just can’t just ‘’hit the brakes’’ like it was a car. If you did you’d be a smear on the inside wall/bulkhead or what ever of your ship.”

That’s what inertial dampeners are for. Duh.