Two cosmos-related lectures will be offered tomorrow evening, but space-time laws might prevent people from attending both.

“;Stepping Stones to the Stars: Hawaii's Rendezvous with Space”; will be the topic of the next Science Cafe tomorrow at P.F. Chang's on Auahi Street in Kakaako.

Jim Crisafulli, director of the state Office of Aerospace Development, will discuss Hawaii's role in space exploration. The 7 p.m. talk will follow a social and dinner hour. For more information, call 956-7930.

“;Oxygen: Breathing the Universe”; will be the topic of a free lecture by Lisa Kewley of the Hawaii Institute for Astronomy at 7:30 p.m. tomorrow in the University of Hawaii-Manoa Art Building Auditorium. Parking is $3.