Earth
The pale blue dot
The only world known to host life. A thin biosphere of liquid water, plate tectonics, a magnetic field, and a stabilizing Moon make Earth uniquely habitable.
Image: NASA / Apollo 17
Vital statistics
Moons
1
Gravity
1.0 g (9.81 m/s²)
Day length
23h 56m
Year length
365.25 days
Diameter
12,742 km
Age
4.54 billion years
Did you know
71% of the surface is water; the deepest ocean point is 11 km.
Fact 01
The magnetic field deflects most of the solar wind.
Fact 02
Earth's core is roughly as hot as the surface of the Sun.
Fact 03
Research & publications
Jump straight into peer-reviewed papers, preprints and authoritative references for Earth.
arXiv (preprints)
Open-access preprints in physics & astrophysics.
NASA ADS
The definitive bibliographic database for astronomy.
Google Scholar
Cross-publisher academic search.
Nature
Peer-reviewed articles in Nature & sister journals.
Wikipedia
Encyclopedic overview & onward references.
Tip: ask the Research AI for a curated reading list → /research
