Name: ?哪個星球離我們最近？ (? Which Planet is the Closest?)
Uploaded: 2021-01-14T10:19:33.000Z
Duration: 3 min 15 s
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My Very Easy Method Just Speeds Up Naming… Planets.

Every Physics classroom has a Solar System line like this.

Looking at the line, which planet is closest to Earth: Venus or Mars?

To answer, you need first know that, like many things in school, the line is a lie.

Planets are not people queuing for coffee, but rather spheroids scattered in space,

always in motion, not in simple circles either, but in ellipses at untidy angles.

In the cold, dark expanse, this is the coziest Venus gets to Earth,

but only about once a year and a half-ish.

Starting close, she orbits far, then comes back, needs some space -- on the other side of the sun.

This means when Venus is away, Mars can be the closest to play.

So because of orbits, there isn’t one answer to, “Who is the closest?”

It's really, “Who is mostly the closest?”

When Mars and Venus are both on the other side of the Sun, it leaves little Mercury the closest.

Each of Earth’s inner three planet friends are at one time the farthest and the closest.

And Mercury, with his smallest orbit, makes him never that far from Earth.

Giving the little guy a uniquely close relationship with Terra.

In fact, watching the planets spin, because of his small orbit, Mercury, not Mars or Venus, is the closest planet most of the time.

Looking at the line, that seems unpossible.

But nonetheless, in the way of actual orbits,

if we keep measuring the distance to all the planets as they spin,

Mercury is Earth's mostest closest neighbor.

But wait, if Mercury is the mostest closest to Earth, he has to be the mostest closest to Venus as well, right?

Because her orbit is smaller than Earth's.

Making Earth's special relationship with Mercury less special.

But at least this is one time where the line provides the obvious answer.

While we’re here, who is Mars’s mostest closest?

On his other side is the asteroid belt, so it should be Earth.

Maybe the rule is the second closest is the mostest closest.

Mercury is the mostest closest to Earth, Venus, and Mars, for the same reason each time.

Bigger orbits make farther average distances for longer times.

So, mercurial Mercury is the constant-est companion.

No, no.  It can't be true for Jupiter too.

Once again, Mercury’s small orbit means he never goes as far away as the other planets with their bigger orbits.

The orbital math that shows Mercury is the mostest closest to Jupiter is the same for all the planets and everything that orbits the sun.

For each of the planets, Mercury is the mostest closest.

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?哪個星球離我們最近？ (? Which Planet is the Closest?)

obvious

enormous

constant

average