Class A stars are bright White-Blue main sequence stars that tend to have a short lifespan. they have extremely high temperatures far greater than out sun, the reason for this is because of its massive hydrogen consumption.
This stars usually have twice the mass and size of our sun examples are Sirius, Vega, Altair. It is rare for this stars to have rocky planets since these stars are really hot and rocky planets might be instantly molten or turned into gas or plasma.
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