What is TRAPPIST-1 b?

About TRAPPIST-1 b:

• It is a hot rocky exoplanet orbiting an ultracool red dwarf star TRAPPIST-1.
• It is the innermost of seven known planets in the TRAPPIST-1 system.
• It has 1.4 times the mass and 1.1 times the radius of Earth.
• It orbits its star at a distance of 0.011 astronomical unit (AU), completing one circuit in just 1.51 Earth days.
• It receives about four times the amount of energy that Earth gets from the Sun.
• TRAPPIST-1b is tidally locked, meaning that one side of the planet always faces the star, and one side looks away. 

What is an astronomical unit (AU)?

• An AU is the average distance between Earth and the Sun, which is about 93 million miles or 150 million kilometres. 
• It is usually used to measure distances within our Solar System.

Q1) What is an Exoplanet?

An exoplanet is any planet beyond our solar system. Most orbit other stars, but free-floating exoplanets, called rogue planets, orbit the galactic center and are untethered to any star.

Source: Earth-like planet expected to be habitable turns out to be a burning furnace

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