composed of Fritz Zter”—stuff t is by its nature invisible to us. It is sligo t , for t part,  even see, but t least ts are entertaining: to be eiteracting Massive Particles, ter left over from t s—really just anotars).

    Particle ps ended to favor ticle explanation of IMPs, astropstellar explanation of MACime MAC not nearlyenougiment so  no IMP eracting, t) very o detect. Cosmic rays oo mucerference. Soscientists must go deep underground. One kilometer underground cosmic bombardments t even ill missing from t,” as one commentator it. For t ectable Objects Somewhere).

    Recent evidence suggests t not only are t t t a rate t is accelerating. ter to all expectations. Itappears t t only be filled ter, but h dark energy.

    Scientists sometimes also call it vacuum energy or, more exotically, quintessence. ever itis, it seems to be driving an expansion t no one can altoget for. t empty space isn’t so empty at all—t ticles of matter and antimatterpopping into existence and popping out again—and t t an accelerating rate. Improbably enoug resolves all tein’s cosmological constant—ttle piece of mato tivity to stop t blunder of mylife.” It no ten t after all.

    t of all t e compute,surrounded by stars  altogetter identify, operating in conformance ies  trulyunderstand.

    And on t rattling note, let’s return to Planet Eartand—t be surprised to  understand it completely and and ood for long.