can humans survive interstellar travel?    can we travel to other planets?    can we travel to other solar systems?    can we travel to other stars?    interstellar travel (literature subject)    matt o dowd    pbs digital studios    physics    public broadcasting service (tv network)    space (quotation subject)    spacetime    star    time (dimension)    travel   

are black holes really black?    astronomy (field of study)    astrophysics (field of study)    black hole (celestial object category)    blazar    blazars    cold quasars    dr. allison kirkpatrick    event horizon    event horizon john michael godier    how supermassive black holes create cold quasars    quasar    quasars    space (quotation subject)    supermassive black holes    supermassive black holes can birth stars    the death of galaxies    what are quasars?    what is a quasar?