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Different aspects of the Earth's environment are shown next to the timescale for comparison, including Earth impacts, solar luminosity, carbon dioxide levels, and oxygen levels. Separately, a table lists the time estimates, downloadable as a spreadsheet, from each study along with references and links to the abstracts of the original articles. Users can download the original study data as
183:-formatted timetrees for further research. In the timeline search, users type the name of a taxon, and all divergences back to the origin of life are show with their taxon names, in a vertical ladder-like figure. Timepanels of Earth's environment also are shown next to the geological timescale, as in all three search options. The third search option,
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was brought to life using animated computer-generated imagery in scenes every 10 minutes during the 2-hour movie. The original development of TimeTree, by Hedges and Kumar, dates to the late 1990s, with initial support from NASA Astrobiology
Institute. Since then, it has been supported by additional
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by either specifying a taxon (group) name or uploading a list of species or other taxa. After specifying a group name, the user can choose which taxonomic level they prefer to view. For example, with a family group name, either a species-level or genus-level timetree can be selected. Then, the
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TimeTree users can search for the names of two species, such as cat and dog, to obtain the mean and median time estimates for their divergence, in millions of years. The results also show all individual time estimates, from each study, next to a geologic timescale, indicating geologic periods.
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of a chosen taxon or user-submitted group of taxa. TimeTree has been used in public education to conceptualize the evolution of life, such as in high school settings. David
Attenborough's Emmy Award-winning film and television program
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file or image for publication. Times on the tree can be explored by clicking on nodes, and obtaining tables of data pertaining to the node. The database also allows search of
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of life from published studies, and allow easy access to that information on the web or mobile device. The database permits searching for average node times between two
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Kumar, Sudhir; Suleski, Michael; Craig, Jack; Kasprowicz, Adrienne; Sanderford, Maxwell; Li, Michael; Stecher, Glen; Hedges, S. Blair (2022).
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grants from NASA, and by NSF and NIH. The current version (v5) was released in 2022 and contains data from 4,075 studies and 137,306 species.
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or higher taxa, viewing a timeline from the perspective of a taxon, which shows all divergences back to the origin of life, and building a
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Metzger KJ (2011). "Helping
Students Conceptualize Species Divergence Events using the Online Tool "TimeTree: The Timescale of Life"".
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Results of a simple nodetime search in TimeTree database for the divergence time of cats and dogs in millions of years
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Hedges, S. Blair; Marin, Julie; Suleski, Michael; Paymer, Madeline; Kumar, Sudhir (2015).
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of life, generated from the TimeTree database, as a framework for the production. The
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Results from a timeline search in TimeTree for humans (Homo sapiens)
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379:"Tree of Life Reveals Clock-Like Speciation and Diversification"
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Hedges, S. Blair; Dudley, Joel; Kumar, Sudhir (4 October 2006).
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Results of a timetree search in TimeTree for
Hominidae.
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articles by author name. The entire open-access book
290:"TimeTree2: species divergence times on the iPhone"
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350:Hedges, S. Blair; Kumar, Sudhir (2009-04-23).
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248:(23). Oxford University Press: 2971–2972.
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
