Question: Have you heard of the Trappist-1 Planets?
Answer: Yes! And there is a wonderful 2 minute video here:
Question: How close are the Trappist-1 Planets?
Answer: If someone looked skyward from a planet’s surface, they might see another planet or more, which could even appear bigger than our dear moon (and you know how much I love gazing at our dear moon!)
In the animation, below, the green area (Habitable Zone), is the distance to/from the star in which life, which is “earth-like” could exist.
Mr. M =^.^=
You can learn more at: http://www.spitzer.caltech.edu/trappist-1