Explanation:

1.    Nuclear fusion is the source of the sun’s energy.
2.    Venus is regarded as earth’s twin planet.
(Venus is sometimes called Earth's twin because Venus and Earth are almost the same size, have about the same mass (they weigh about the same), and have a very similar composition (are made of the same material).
3.    Venus is the hottest planet of the solar system.
(mercury is the planet that is closest to the sun and therefore gets more direct heat, but even it isn't the hottest. Venus is the second planet from the sun and has a temperature that is maintained at 462 degrees Celsius, no matter where you go on the planet. It is the hottest planet in the solar system.