not all of you, would say - Halley's Comet.

So what# exactly makes Halley's Comet so famous?

## The short answer is that Halley' Comet was the first time# astronomers understood that comets came back.## They could be repeat visitors in our night# skies.

See before Halley's Comet was discovered,## the common belief was that comets made only one# pass through our solar system and then disappeared,## but in the early 1700s, astronomer Edmond Halley figured out that all these bright comets that## were reported over hundreds of years, it wasn't# many comets, but just one that was periodically## making return trips through our solar system,# and that comet was named after him, Halley's Comet.## And in fact Halley's comet has been connected to# ancient astronomical observations going back## over 2,000 years.

It's famously featured in an# ancient tapestry that chronicles the Battle of## Hasting in 1066.

Halley's Comet is connected to tons of# other human history too, but my personal favorite## is the American author Samuel Clemens.

He was born# in 1835, the same year Halley's Comet flew by.

It was## coming back in 1910 and so in 1909, the author# wrote, "They came in together, so they must go## out together."

That author Sam Clemens is actually# known as Mark Twain and he died the day after the## comet reached its perihelion, so he was right.# Now Halley's Comet has been in orbit for at least## 16,000 years and it's shown no signs of aging, so# it's got quite the impressive lifetime.

It shoots## past Earth every 76 years, which makes its next# predicted appearance to be in 2061, so you can## sit back and relax for a bit before that happens,# but in the meantime, Star Gazers, keep looking up!## For more Star Gazers, click the video below.

Don't# leave me hanging.

Come on, click it, click it.