I’m a liar. I can’t help it. Each page I write has something wrong to a degree and — no surprise — readers often catch on. “Two months ago, you wrote that the solar system is heading toward the star Deneb in Cygnus. But my textbook says we’re actually moving toward Vega in Lyra.”
That person was right. But so was I. How can two conflicting statements both be correct? That’s this month’s subject.Astronomy magazine subscribers can read the full column for free. Just make sure you're registered with the website.