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The TRAPPIST-1 star is home to the largest batch of roughly Earth-size planets ever found. Now we know even more about the densities of these seven rocky worlds. And the composition of the TRAPPIST-1 planets could be notably different than Earth's! https://go.nasa.gov/3c78qST pic.twitter.com/K4TOgYgYE2
In our solar system, planet densities vary widely. The gas giants – Jupiter, Saturn, Uranus & Neptune – are larger, but far less dense than terrestrial Earth, Mars, Venus & Mercury. The TRAPPIST-1 planets all have similar densities, meaning they're likely made of the same things.pic.twitter.com/kps0xwgvoX
The difference in density between the TRAPPIST-1 planets and Earth and Venus may seem small – about 8% – but it is significant on a planetary scale. This could mean a lower percentage of iron in the exoplanets, or higher levels of oxygen, forming iron oxide, or rust.pic.twitter.com/wZNIhLlba0
Is it located 39 light-years away from us?
about 40 light-years
Can we send a camera to take pictures thereof? Pictures may reach to us after 400 years, which may be OK.
Hello Nasa. I'm Wondering if the James Webb mision is going to research this system and could it still be suitable for life? Thanks!
Yes, it is! There are several Guaranteed Time programs on JWST which will study TRAPPIST-1 in detail.
Any indication of gas giants or is it too early to say?
So you are telling me there's a chance
I must wear my glasses 
I thought it said: The TRAPPIST-1 star is home to the largest BITCH of roughly Earth-size planets ever found.pic.twitter.com/rjhMsCWo5Z
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