Wait I live in New Jersey, USA. Is this the location these guys are talking about.

dark matter is really cool. if it hits you you can become super powerful like hancock

I have always enjoyed Pop Sci most of my life. I made a paper mache model of the NERVA-K or KIWI nuclear rocket motor many years ago in grade school for a science project based upon the article that appeared in the print version of your magazine. I extrapolated the existance of the modern developed nuclear engine from the French LTGR or low temp gas recirculation reactor that uses plutonium fuel particles or crumbs in a ceramic matrix in these ceramic pellets made with just the right ratios of fissionable material fuel to inert ceramic matrix substrate to create a fission temperature infrared radiation of just 475 degrees farenheit. The French reactor design uses enriched uranium and is intended for safe reactors that would never melt down where as the rocket motor uses the more deadly plutonium for maximum heat generation for heating the coolant flluid, in this case either the atmospheric gases or helium which exhaust the motor as extremely highly radioactive and very deadly material being vented directly to the atmosphere. There was the case of June and Betty Cable in Texas, where testing of the engine and launch platform went on secretly for years and they happened to be driving along one night as the vehicle came down to hover over the road in front of their car, making them and the road extremely radioactive, giving the women radiation poisoning. Of course the federal government and the military have denied any wrong doing or compensated the women and they may even have died by now. I suggested a redesign and install a closed loop cooling system for extacting the heat for creating the high pressure exhaust for lift thrust, I don't know if they did it. Dark matter is nothing more than the mass signature or quantum gravitational signature of the vacuum energy of the fabric of space that we could possibly tap into for releasing energy for useful purposes in nearly infinite amounts relatively speaking, the theoretical "Zero point module" energy on Stargate Atlantis TV show.

(dark matter is really cool. if it hits you you can become super powerful like hancock)
if you get hit by dark matter the tremendous force it took to hit you would kill you so its sirta dangerous

so first thing. by back yard there referring to our galaxy because in the grand scheme of things our planet is microscopic and your back yard... ya not going there.
second gamma rays are deadly in high concentration and cause cancer in small doses. so something that emits large quantities of gamma radiation will impact your body with phenomenal force vaporising everything.