All About Space - - Nasa Apps -


The top of the list of com­par­a­tive char­ac­ter­is­tics is the size of the planet, with the coloured re­gion rep­re­sent­ing the di­am­e­ter of the world, and the in­ner cir­cles com­par­ing their size to Earth and Mars. This gives a good sense of scale and also re­veals how these plan­ets aren't so far off the size of Earth.


The creators of this app have used the term ‘il­lu­mi­na­tion’, how­ever, I be­lieve the more ap­pro­pri­ate term would be ‘tem­per­a­ture’, as the nar­ra­tion speaks more about whether the planet is hot­ter or colder in re­la­tion to its rel­a­tive il­lu­mi­na­tion in­di­ca­tion.


The den­sity of a planet is a strong in­di­ca­tion of whether astronomers are look­ing at rocky plan­ets or a gas planet. Rocky plan­ets have a much higher den­sity mea­sure­ment, and all the TRAPPIST-1 plan­ets have den­si­ties close to Mars and Earth, in­fer­ring they are most likely ter­res­trial.

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