Short note on Venus and Mercury:

Venus:
- Venus is the second planet from the Sun and is often referred to as Earth's sister planet due to its similar size and composition.
- It is named after the Roman goddess of love and beauty.
- Venus has a thick atmosphere composed mainly of carbon dioxide, with clouds of sulfuric acid that create a greenhouse effect, resulting in extremely high surface temperatures.
- The average surface temperature on Venus is around 900 degrees Fahrenheit (475 degrees Celsius), making it the hottest planet in the solar system.
- Venus has a slow rotation, taking about 243 Earth days to complete one full rotation, which is longer than its year (225 Earth days).
- It is also known for its retrograde rotation, meaning it rotates on its axis in the opposite direction compared to most other planets.
- Venus has a dense atmosphere that traps heat, causing a runaway greenhouse effect and making it the hottest planet.
- Venus has no moons and has a rocky surface with numerous impact craters, volcanoes, and mountains.
- It is often referred to as the "evening star" or "morning star" due to its brightness and visibility in the sky.
- Venus is a terrestrial planet with a similar size and composition to Earth but has a drastically different climate and conditions.

Mercury:
- Mercury is the closest planet to the Sun and is the smallest planet in the solar system.
- It is named after the Roman god of commerce, communication, and travel.
- Mercury has a thin atmosphere composed mainly of helium and traces of other elements, but it is so thin that it is often considered to be in a vacuum.
- Due to its proximity to the Sun, Mercury experiences extreme temperature variations, with surface temperatures ranging from -290 degrees Fahrenheit (-180 degrees Celsius) to 800 degrees Fahrenheit (430 degrees Celsius).
- Mercury has a slow rotation and completes one rotation on its axis in about 59 Earth days, but it has a relatively short year, taking only 88 Earth days to orbit the Sun.
- It is heavily cratered, with numerous impact craters on its surface, similar to the Moon.
- Mercury has no moons and has a rocky composition, with a large iron core that makes up about 70% of its volume.
- It has a tenuous magnetic field and a thin exosphere consisting of atoms and ions released from its surface.
- Due to its proximity to the Sun, observing Mercury from Earth can be challenging, as it is often hidden in the Sun's glare.
- Mercury is often referred to as the "swift planet" due to its fast orbital speed around the Sun.