Another point to make about the phrase, "VENUS IS GREEN" is how people back on Earth received the message.

And parades assembled,

the loud earth tellers spent

all fifteen minutes on it, even

shortened their weather forecast.

Sexton spends all of one measly line on saying that Earth was proud of its achievement. They held parades and all the "loud earth tellers" (what I assume today means talking heads) proclaimed the message. However, that only lasted 15 minutes until the whole of Earth was back at war with each other. I think here she is trying to point out that whenever something absolutely extraordinary happens on Earth, people and media only give it a fraction of their attention.