Finally, after 19 hours the first energy burst
reaches the receding lobe and it becomes visible. But remember, this flare in the receding
lobe and the previous flare in the advancing lobe occur at the same time and have the same
brightness! They only appear different because of their large speed toward us or away from
us. The real time for the first flare to travel from the radio core to both lobes was five
hours. Meanwhile, the energy burst from the second flare has almost reached the
approaching lobe. |