>> Kepler-452b is 60 percent larger in diameter than Earth and is considered a super-Earth-size planet.
And then:
>> Kepler-452 is 6 billion years old, 1.5 billion years older than our sun, has the same temperature, and is 20 percent brighter and has a diameter 10 percent larger.
I noticed the lack of "b" on that second one, but they seem to be talking about a single planet.
Earth is 12,742 km in diameter, so "b" must be 20,387 km in diameter.
Our Sun is 1,391,684 km in diameter, so Kepler-452 must be 1,530,852 km in diameter.
Since the star is 10% larger and 20% brighter, but the same temperature, does that mean it is burning fuel 20% faster, and will enter its later stages earlier?
Yep, you understand it correctly.
"The name of a newly discovered exoplanet is dependant on the name of the star which it orbits and also if any other exoplanets orbiting the same host star have been discovered. The first exoplanet discovered around a star is given its host star name with ‘b’ appended. The next exoplanet discovered in the same system gets the letter ‘c’ appended and so on. Planets in multiple planet systems are always labelled b, c, d… in the order of discovery."
It's not clear to me why they would begin with 'b' instead of 'a', but basing the order of names on the order of discovery makes intuitive sense. The largest planets would presumably be discovered first, even though they may be in the middle zone of their systems (such as in the Solar System).
EDIT: Kepler-26[2] is an example of the named order not matching the distance from the star. The planets in that system, in order of distance from their star, are: d, b, c, e
[1] https://www.paulanthonywilson.com/blog/how-are-exoplanets-na...