Superluminal
Motion?
• blob’s actual
speed of
ejection = 5/6 x c
• moves 5 lyrs in 6 yrs
• from earth, we see blob separation =
3 lyrs
• light from A arrives in 2000
• from B in 2000 +6 -4
• appears that blob moved 3 lyrs in 2 yrs
= 1.5 x c