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We present Far Ultraviolet Spectroscopic Explorer (FUSE) observations of themolecular, neutral atomic, weakly ionized, and highly ionized components of theinterstellar and intergalactic material toward the quasar 3C 273. We identifyLy-beta absorption in 8 of the known intergalactic Ly-alpha absorbers along thesight line with rest-frame equivalent widths greater than 50 mA. Refinedestimates of the H I column densities and Doppler parameters (b) of the cloudsare presented. We find a range of b = 16-46 km/s. We detect multiple H I lines(Ly-beta - Ly-theta) in the 1590 km/s Virgo absorber and estimate log N(H I) =15.85, ten times more H I than in all of the other absorbers along the sightline combined. The Doppler width of this absorber, b ~ 16 km/s, implies T <15,000 K. We detect O VI absorption at 1015 km/s at the 2-3 sigma level thatmay be associated with hot, X-ray emitting gas in the Virgo Cluster. We detectweak C III and O VI absorption in the IGM at z=0.12007; this absorber ispredominantly ionized and has N(H+)/N(H I) > 4000/Z, where Z is themetallicity. Strong Galactic interstellar O VI is present between -100 and +100km/s, with an additional high-velocity wing containing about 13% of the total OVI between +100 and +240 km/s. The broad O VI absorption wing likely traces theexpulsion of hot gas out of the Galactic disk into the halo. A limit on theamount of diffuse O VI emission present 3.5 arc minutes off the sight linecombined with the observed O VI column density toward 3C 273, implies n_e <0.02 cm^-3 and P/k < 11,500 cm^-3 K for an assumed temperature of 3x10^5 K.(abbreviated version)Comment: 59 pages, 15 figures, aastex condensed format, to appear in the Nov.  10, 2001 issue of the Astrophysical Journa

Far‐Ultraviolet Spectroscopy of the Intergalactic and Interstellar Absorption toward 3C 273