Planetary alignments are caused by the fact that all of the planets in our solar system orbit the sun in the same direction. As they orbit, they appear to move across the sky from east to west. When they are aligned, it means that they are all in the same part of the sky at the same time.
Planetary alignments are not always visible from Earth. This is because the planets are not always in the same part of the sky at the same time. For example, if you are in the Northern Hemisphere, you will not be able to see Mercury or Venus during the winter months.
The best time to see a planetary alignment is during the evening hours, after sunset. This is because the planets are all visible in the western sky after sunset. You can use a star chart or planetarium software to find the planets in the sky.
The five brightest planets in the night sky are Venus, Mars, Jupiter, Saturn, and Mercury. Venus is the brightest planet and can be seen even in the daytime. Mars is a reddish color and is often visible in the evening sky. Jupiter is the largest planet in our solar system and is a bright yellow color. Saturn is a pale yellow color and has rings that can be seen with the naked eye. Mercury is the closest planet to the sun and is often difficult to see because it is so close to the sun. However, it can be seen in the morning sky before sunrise or in the evening sky after sunset.
The brightness of a planet is determined by its size, distance from the sun, and albedo (reflectivity). Venus is the brightest planet because it is the closest planet to the sun and has a high albedo. Mars is also a bright planet because it is a reddish color and reflects light well. Jupiter and Saturn are also bright planets because they are large and have high albedos. Mercury is the least bright planet because it is the smallest planet and has a low albedo.
The brightness of a planet can also change depending on its position in its orbit around the sun. For example, Venus is brightest when it is between the Earth and the sun (a conjunction). Mars is brightest when it is closest to the Earth (opposition). Jupiter and Saturn are always bright, but they can appear brighter when they are closer to the Earth. Mercury is the least predictable planet because it is so close to the sun. It can appear very bright when it is visible in the morning or evening sky, but it can also be very difficult to see.
Mercury is hot and cold, too
The side of Mercury facing away from the Sun is cold. Temperatures on this side of Mercury can drop to as low as -290 degrees Fahrenheit (-179 degrees Celsius).
The temperature difference between the day and night sides of Mercury is extreme. The side of the planet that is facing the Sun can reach temperatures of up to 800 degrees Fahrenheit (427 degrees Celsius).
Also, Mercury is tidally locked to the Sun, which means that the same side of the planet always faces the Sun. The temperature difference between the day and night sides of Mercury is extreme.