The ancient life on Mars was eradicated by aliens armed with nuclear weapons, plasma physicist and an expert in propulsion technologies Dr John Brandenburg believes. He therefore warns that a nuclear attack of this kind will also happen on Earth.

In his paper titled "Evidence of a Massive Thermonuclear Explosion on Mars in the Past, The Cydonian Hypothesis and Fermi's Paradox," Brandenburg concludes that the Earth's interstellar neighbourhood has forces or beings hostile to young, noisy, civilisations like the ones people has on Earth. It is with the same reason that aliens launched a nuclear attack against the ancient life on Mars, he said.

Brandenburg outlined apparent evidence that immense nuclear explosions happened on Mars twice, attacking two sites of the early life -- the Cydonians and the Utopians. He said these two sites were erased by nuclear bombs launched by highly advanced aliens. He said the red colour of the surface of Mars proved that nuclear explosions happened on its surface. Back in 2011, he attributed the red colour with natural nuclear reaction or a nuclear device detonation. However, in his final paper presented during the 2014 Annual Fall Meeting of the American Physical Society Prairie Section in Monmouth, Illinois, he upheld that nuclear attacks from aliens caused the appearance that Mars has today.