shape. Observations in 2004 by the Very Long Baseline Array for 42 consecutive days gave new data and understanding of the action of the jets. It appears that the jets are sometimes impacting material shortly after being created and thus brightening. The material the jets are impacting appears to be replaced some of the time, but not always, leading to variations in the brightening of the jets. The spectrum of SS 433 is affected not just by Doppler shifts but also by relativity: when the effects of the Doppler shift are subtracted, there is a residual redshift which corresponds to a velocity of about 12,000 kilometers per second. This does not represent an actual velocity of the system away from the Earth; rather, it is due to time dilation, which makes moving clocks appear to stationary observers to be ticking more slowly. In this case, the relativistically moving excited atoms in the jets appear to vibrate more slowly and their radiation thus appears red-shifted. In September 2018, A. U. Abeysekara et al. published in Nature details of investigations using the High-Altitude Water Cherenkov Gamma-Ray (HAWC) Observatory in Mexico. They reported teraelectronvolt γ-ray observations exceeding 25TeV of the SS 433/W50 system that spatially resolve the lobes, and consistent with a single population of electrons with energies extending to at least hundreds of teraelectronvolts in a magnetic field of about 16 microgauss. In popular culture In SNL Season 4 (1979), Father Guido Sarducci mentions SS 433. In the Seven Wonders of The World documentary series, Arthur C. Clarke mentions SS 443 as one of his "seven wonders of the universe". See also High-mass X-ray binary References Further reading Image SS 433 Strange gamma-ray heartbeat puzzles scientists - article with video at DESY News Stellar black holes Aquila (constellation) Microquasars Eclipsing binaries Aquilae, V1343 A-type supergiants