The red planet

Mars

What you can realistically expect

Mars often appears much smaller than beginners expect. During opposition it may show a bright polar cap and darker markings. Surface detail depends heavily on its apparent size and atmospheric conditions.

The red planet — its colour is unmistakable to the naked eye.

Beginner

What is it?

Mars is roughly half the diameter of Earth, with a rusty-red surface. Its apparent size and detail from Earth vary dramatically depending on where the two planets are in their orbits — the best views come around opposition, roughly every 26 months.

What will I see?

Naked eye

An obvious reddish-orange point of light. Brighter than most stars when near opposition.

Small telescope

A small orange-red disc. Around opposition, dark surface markings and a bright polar cap may be visible.

Medium telescope

Surface features are subtle but real: dark plains, the bright polar cap, and occasional dust storms.

Reference imagery from long-exposure photography usually shows far more colour and structure than the human eye can see through a telescope.

Reference image

Processed image

NASA, ESA, the Hubble Heritage Team (STScI/AURA), J. Bell (ASU), and M. Wolff (Space Science Institute) · NASA Science

Long-exposure or processed astronomy images can show much more colour and structure than you may see through an eyepiece.

Observing tips

Wait for Mars to be near opposition for meaningful telescope detail. Between oppositions, the disc is small and features are hard to see.
High magnification helps — but only when the atmosphere is steady.

Interesting facts

About half the diameter of Earth.
Has the tallest volcano and deepest canyon in the Solar System.
Two tiny moons: Phobos and Deimos.