The Trappist-1 system

In this course, we will be learning about the Exoplanet system, TRAPPIST-1.




Let's learn about the TRAPPIST-1 exoplanet system.


Exoplanets, what are they?

Exoplanets are planets from another solar system that circle around a different star from our own.

Trappist-1 Planets

TRAPPIST-1 Planets

In the TRAPPIST-1 solar system there are 7 planets. 3 of them are in the hot zone (which means it is too close to the sun for water), 3 are in the inhabitable zone (water is able to exist) and one is on the outskirts where it is too cold for water to be liquid.

TRAPPIST Telescope

The telescope that found the new Exoplanets was called the TRAPPIST telescope, hence the name of the solar system.

The telescope spotted the TRAPPIST-1 system using a technique called, transit photometry. Transit photometry is when a telescope will focus on a star and wait for the star to become dimmer. When the star is dimmer, it means that something has crossed in front of the star. Depending on how dim the star gets, it can determine how big the planet is. It can also determine how long it takes for the planet to circle around the star.

TRAPPIST-1 Orbital Periods


Please proceed to the next page to test your knowledge.

How many planets in the TRAPPIST-1 system?

  • 9
  • 7
  • 8
  • 6

The TRAPPIST-1 solar system was named after a telescope.

  • true
  • false

what is an exoplanet?

  • an exoplanet is a planet that circles around the sun.
  • an exoplanet is a moon that circles around a different planet to our own
  • an exoplanet is a planet that circles around a different star to our own
  • an exoplanet is a planet that circles in the inhabitable zone.