History of the Universe Flashcards
When did the Big Bang occur?
About 13.7 billion years ago
What elements were created in the Big Bang?
Hydrogen
Helium
and some Lithium
When did the Milky Way galaxy form?
About 12 billion years ago
When did the earth form?
Approximately 4.6 billion years ago
When did the first unicellular life appear on Earth?
About 3.8 billion years ago
When did multicellular life first appear?
Around 1 billion years ago
When did mammals first appear?
Approximately 200 million years ago.
When did modern humans first appear?
About 40 000 years ago
When did the first civilizations form?
Around 6 000 years ago
What is a supernova?
A massive explosion marking the end of a large star’s life.
When did vertebrates first appear?
Approximately 500 million years ago
What was the Cambrian Explosion?
A period when most major animal groups appeared in fossil record
When did dinosaurs go extinct?
About 65 million years ago
How old is the Sun?
About 4.6 billion years old
When did plants first move onto land?
Around 475 million years
What are vertebrates?
Animals with backbones
When did the first fish appear?
Around 530 million years ago
When did early humans start using tools?
About 2.6 million years ago
When did Homo sapiens first emerge?
Around 200 000 years ago
What event marked the beginning of human history?
The development of writing around 5 000 years ago
