Seth Shostak, a senior astronomer at the SETI Institute in Mountain View, California, also was cautious in calling the particles alive.

加利福尼亚州搜寻地外文明学会(SETI Institute)的资深天文学家塞思·肖斯塔克也表现得非常谨慎，并不急于将这些粒子称为生命。

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Seth Shostak, an astronomer at the SETI Institute in California, speculated in 2011 that there could be 30, 000 habitable worlds within 1, 000 light-years of Earth, a minuscule distance by galactic standards.

ECONOMIST: Extra-terrestrial life

"In some sense, this is all academic, because we have been broadcasting to aliens for decades, " says Seth Shostak, senior astronomer at the SETI Institute, a nonprofit organization dedicated to the search for extraterrestrial intelligence.

FORBES: How To Talk To Aliens

Seth Shostak, the group's current chairman, disagrees.

ECONOMIST: An argument over whether to send messages to aliens