The correct answer is Venus.

• Venus is the hottest planet in the solar system.
• Although Venus is not the planet closest to the sun, its dense atmosphere traps heat due to the greenhouse effect makes it our solar system's hottest planet.
• Venus is known as the twin sister of earth.
• Venus is also known as the Morning star or Evening star.
• Hence, option 1 is correct.

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• There are eight planets in the Solar System.
• From the closest to farthest from the Sun, they are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
• The first four planets are called terrestrial planets.
  • They are mostly made of rock and metal, and they are mostly solid.
• The last four planets are called gas giants.
  • This is because they are much larger than other planets and are mostly made of gas.
• The Solar System also contains other things.
  • There are asteroid belts, mostly between Mars and Jupiter.
  • Further out than Neptune, there is the Kuiper belt and the scattered disc.
  • These areas have dwarf planets, including Pluto, Makemake, Haumea, Ceres, and Eris.
  • There are thousands of very small objects in these areas. There are also comets, centaurs, and there is interplanetary dust.