I will discuss observational evidence suggesting the presence of
high-velocity ejecta in the for of opposing jets in likely remnants of
core-collapse SNe. I will concentrate on the bright radio and X-ray source
Cassiopeia A (Cas A), the youngest known supernova remnant in the Milky
Way, which shows optical jets of S-rich ejecta moving at10,000 - 15,000 km/s. While these jets are best seen in optical HST
images, they are coincident with extended emission observed in both the
X-rays and infrared.
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