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13,800 BCE
Big band event
The Short Answer: The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now and it is still stretching. -
1000 BCE
Solar system or milky way
The Milky Way is the galaxy that includes our Solar System, with the name describing the galaxy appearance from Earth, a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye. -
600 BCE
Multicellular life
All species of animals, land plants and most fungi are multicellular, as are many algae, whereas a few organisms are partially uni- and partially multicellular, like slime molds and social amoebae such as the genus Dictyostelium.[2][3] -
454 BCE
Earth
Earth consists of land, air, water and life. The land contains mountains, valleys and flat areas. The air is made up of different gases, mainly nitrogen and oxygen. The water includes oceans, lakes, rivers, streams, rain, snow and ice. -
453 BCE
Moon
The Moon is Earth's only natural satellite and the fifth largest moon in the solar system. The Moon's presence helps stabilize our planet's wobble and moderate our climate. The Moon's distance from Earth is about 240,000 miles (385,000km). The Moon has a very thin atmosphere called an exosphere. -
300 BCE
Humans
human being, a culture-bearing primate classified in the genus Homo, especially the species H. sapiens. Human beings are anatomically similar and related to the great apes but are distinguished by a more highly developed brain and a resultant capacity for articulate speech and abstract reasoning. -
245 BCE
Dinosaur
Dinosaurs are prehistoric reptiles that have lived on Earth from about 245 million years ago to the present. Modern birds are one kind of dinosaur because they share a common ancestor with non-avian dinosaurs. Non-avian dinosaurs (all dinosaurs besides birds), which are now extinct, varied greatly in shape and size. -
45 BCE
Sun
The Sun is a yellow dwarf star, a hot ball of glowing gases at the heart of our solar system. Its gravity holds everything from the biggest planets to tiny debris in its orbit.
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1 CE
Unicellular life
Life on earth evolved from a single cell millions of years ago. These single cells are known as unicellular organisms. All the life processes in a unicellular organism, including digestion, excretion, respiration, occur within a single cell. These cannot be seen by naked eyes and are hence called microorganisms.