Credit & Copyright: Pablo Carlos Budassi via
Wikipedia
Explanation:
What's happened since the universe started?
The time spiral shown here features a few
notable highlights.
At the spiral's center is the
Big Bang, the place where
time,
as we know it,
began about 13.8 billion years ago.
Within a few billion years
atoms formed, then
stars formed from atoms,
galaxies formed from stars and gas,
our Sun formed,
soon followed by
our Earth,
about 4.6 billion years ago.
Life on Earth begins about 3.8 billion years ago,
followed by
cells, then
photosynthesis within a billion years.
About 1.7 billion years ago,
multicellular life on Earth began to flourish.
Fish began to swim
about 500 million years ago, and
mammals
because walking on land about 200 million years ago.
Humans
first appeared only about 6 million years ago,
and made the
first cities
only about 10,000 years ago.
The time spiral illustrated stops there, but human
spaceflight might be added,
which started only 75 years ago, and useful
artificial intelligence began to take hold
within only the past few years.
Explore Your Universe:
Random APOD Generator
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
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