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Earth and Space

Magnetism

Since ancient times, people have known about some rocks that could attract iron. When these rocks were rubbed on other types of metal, they had the power to make them attractive too. These items could also push each other away, repelling each other.

A dark grey and brow rock with a textured surface. On this, three metal nails are sticking to it.
This work by James St. John is licensed under Creative Commons Attribution 4.0 International
Lodestone, one of a  few minerals that are naturally magnetic.

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

Sky Coordinates

We use coordinate systems to find the position of a point on a surface. 

For example, Latitude and Longitude are used to locate a position on the Earth's surface. They are both measured as angles.

Two diagrams of the Earth showing lines of latitude and longitude. The left diagram displays the Western Hemisphere, while the right diagram focuses on the North Pole and surrounding areas
This work by Djexplo is licensed under Creative Commons Zero v1.0 Universal
Illustration of geographic latitude and longitude of the earth

Stargazing Glossary

Welcome to our stargazing glossary! 

Here, you'll find key terms that will help you better understand the wonders of the night sky. 

The image shows a person looking through a telescope silhouetted against a starry night sky, with a clear view of the Milky Way. On the right side, there is an icon of a book labeled "A-Z," indicating a glossary
This work by The Schools' Observatory is licensed under All rights reserved