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Atmosphere

Life on Earth

Planet Earth was formed around 4.5 billion years ago.  The first signs of life began about 3.6 billion years ago, in the ocean. The water in the ocean protected organisms living there from the dangerous rays of the sun. 

An illustrated timeline of the evolution of life on Earth, starting with the ignition of the Sun and the formation of the Earth and Moon. The timeline tracks key events such as the appearance of prokaryotes, the development of photosynthesis, the rise of eukaryotes, and the Cambrian explosion. Further along the timeline, it shows the evolution of vertebrates, reptiles, mammals, birds, and humans, with markers for significant milestones such as fire, writing, and the appearance of Homo sapiens
This work by LadyofHats is licensed under Creative Commons Zero v1.0 Universal
The timeline of life evolving on Earth

Climate Change

The Earth's climate is always changing. It shifts through a regular cycle of temperatures. These cycles last around 100,000 years. They move the Earth through warm periods, then cold ones. This is known as climate oscillation. 

An infographic illustrating changes in average temperature, displayed in Fahrenheit. The graphic uses color gradients and numerical values to represent temperature shifts over time, indicating warming trends
This work by NASA is licensed under Creative Commons Zero v1.0 Universal

Atmospheric Problems

The Earth's atmosphere is vital for life. But did you know it can cause problems for astronomers. 

Liverpool Telescope with the Milky Way galaxy arm
This work by The Schools' Observatory is licensed under All rights reserved
Liverpool Telescope with the milky Way