Solar Appreciation Day is celebrated on the 2nd Friday of March.
The Sun itself is just a huge ball of plasma made of hydrogen and helium held together by gravity and powered by nuclear fusion.
Around 4.5 billion years ago, when Earth's magma ocean was still cooling down, the sun was 30% dimmer than it is now, but the climate was as warm as it is now.
This dilemma is known as the "faint young Sun paradox."
The hazy atmosphere of early Earth was probably made of fewer reflective gases in the upper part of the atmosphere and powerful greenhouse gases in the lower parts.
Without greenhouse gases like methane, early Earth would have frozen into an ice ball for the first few billion years of its existence.
Even Carl Sagan got troubled by the "faint young Sun paradox". The most debated explanation is something called the Gaia hypothesis, is a weird concept but it says that all the life on Earth, especially the microbes that operate the Earth's life support system, can change the composition of the atmosphere and transform it such that it creates a nice climate on Earth.
The exact way, how microbes can do this is not completely understood by scientists yet.
One other thing that bothers me is that, just before the "Great Oxygenation Event," why did anaerobic bacteria allow oxygen-producing microbes to oxygenate Earth's atmosphere? which ultimately doomed most of the anaerobic bacteria.
The James Webb Space Telescope, launched last year on Christmas Day, is still cooling down in deep space to allow its infrared instruments to start operating.
The first images are expected in a few months. JWST also can study the earliest stars and planets, which can resolve some of the most debated issues in Astronomy, Astrobiology, Planetary Geology, and other unknown questions!