Our sun is the engine driving all the environment on Earth. All the energy we use, besides nuclear energy, comes from the sun, either now or in the past, stored in fossil fuels.
The sun is able to degrade or disrupt our power, transportation and communication infrastructure.
Current thinking says that here on our planet, chemical-based life such as ours started in the bodies of water, slimy rocks or muddy waterside places.
Organic molecules that are inherited from the solar system’s birth cloud reacted together and formed increasingly complex molecules.
This evolved until they crossed the boundaries between non-living and living material. Lab experiments support the idea that this whole thing happened.
Focusing on chemical-based life
Until experts find out other kinds of lives, the whole focus in on finding chemical-based life.
Since the chain of chemical reactions from simple molecules to the complex chemicals that are driving the processes of life is a pretty long one and it was assumed that the best planetary candidates for life would be orbiting red dwarf stars, according to astronomer Ken Tapping.
“These stars are stable for billions or tens of billions of years, allowing lots of time for the chemistry to proceed, and do not give off harmful levels of ultraviolet radiation, which can break down complicated molecules,” Tapping says.
It’s also important to consider the changes that happen on a planet when life appears.
The original atmosphere made up of chemicals that have been inherited from the birth cloud is very rich in greenhouse gases.
For instance, when life got here on Earth, around 3.5 billion years ago, the early plants assimilated the greenhouse gases and replaced them with oxygen.
Our sun is 30% brighter than 3.5 billion years ago
This would have caused the Earth to cool, but today we know that the planet was warm enough to hold liquid water.
The reduction in the greenhouse effect has been balanced by the fact that the sun became brighter. Now, the sun is 30% brighter than when life appeared here.
After 3.5 billion years, the temperature of our planet has not changed so drastically to endanger the plants and creatures living here.
“Red dwarf stars do not produce much ultraviolet and are not well suited for driving these chemical processes. On the other hand, stars like the sun produce a good supply of ultraviolet. Hotter, bluer stars produce so much that complex molecules would be destroyed,” Tapping said.
Rada attended the courses in the Faculty of Letters, Romanian-English section, and finished the Faculty of Theatre and Television, Theatrical Journalism section, both within the framework of Babeş-Bolyai University of Cluj-Napoca. Up till now, she reviewed books, movies, and theatre-plays, enjoying subjects from the cultural niche. Her experience in writing also intersects the IT niche, given the fact that she worked as a content editor for firms that produce software for mobile devices. She is collaborating with online advertising agencies, writing articles for several websites and blogs.