This reminds me of a story…
A high school kid was half-dozing at the back of the science class, not paying much attention to the teacher’s lecture.
At the front of the room, the teacher had just finished describing how ”... in a few billion years the Sun will exhaust its nuclear fuel and probably shrink into a Red Dwarf star, at which time all life on Earth will cease.”
The kid bolted upright in his chair. ”What?” he exclaimed. “Would you repeat that, please?”
The teacher, pleased to see that he had gotten the kid’s interest, repeated what he had just said, ”... in a few billion years the Sun will exhaust its nuclear fuel and probably shrink into a Red Dwarf star, at which time all life on Earth will cease.”
“Oh, okay then,” the kid said. “Whew. I thought you said a few million years.”
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Yeah. Of course the Earth is on a collision course with some kind of doom. A few million years, a few billion years… who’s going to know?