# Riddle Poem: I'm always on a plane, won't fit on a boat or train

Who or what is this poem referring to?

I'm always on a plane
Won't fit on a boat or train

Unlike most of my brethren
I travel with no companions

Simultaneously cold and hot
I can be a dark or light spot

To some I may be unrecognizable
At times I'm not even visible

From my routine I never deviate
But sometimes I'm seen doing the opposite

I've suffered battering and bruising
Since I've no protective layering

Subjected to a stiff breeze
No one near me can breathe

• That's why it's not a jet engine. :) – pacoverflow Apr 27 '15 at 17:29
• Arg, the contradictions in this poem! – Mark N Apr 27 '15 at 19:34
• @IanMacDonald You have good intentions, but the poem seems a little too personal to edit, given how much time I put into it. Hope you understand. – pacoverflow Apr 27 '15 at 19:56
• @pacoverflow No problem. Carry on! – Ian MacDonald Apr 27 '15 at 20:01

Is it

Mercury (the planet)?

I'm always on a plane Won't fit on a boat or train

Each planet has an orbital plane

Unlike most of my brethren I travel with no companions

Has no moon

Simultaneously cold and hot I can be a dark or light spot

Cold and dark on the far side, hot on the sun side. Dark if in front of the Sun and light if not

To some I may be unrecognizable At times I'm not even visible

Often mistake for a star. Not always visible.

From my routine I never deviate But sometimes I'm seen doing the opposite

Always orbiting the Sun, but planets appear in retrograde sometimes

I've suffered battering and bruising Since I've no protective layering

No atmosphere. Gets hit by stuff

Subjected to a stiff breeze No one near me can breathe

Mercury's magnetic field is weak enough to not protect from solar wind. No atmosphere to breathe

• Yes but see if you can get the "plane", "dark or light spot", and "breeze" clues. – pacoverflow Apr 27 '15 at 15:42
• @pacoverflow I took another shot at those clues. – Ric Apr 27 '15 at 15:55
• There is a more elegant answer for the "plane" clue. – pacoverflow Apr 27 '15 at 17:20
• Its orbital plane doesn't change. – Ian MacDonald Apr 27 '15 at 17:47
• For the "plane" reference, see en.wikipedia.org/wiki/Ecliptic – A.D. Apr 27 '15 at 18:04