Moon

Europa

Solar System

Scientific overview

Europa is a moon orbiting Jupiter.

Physical characteristics

Mass	0.048 ×10²⁴ kg
Diameter	3,122 km
Radius	1,560.8 km
Density	3.013 g/cm³
Albedo	0.67
Magnitude	5.29

Sources

Facts on this topic will be cited from these primary and reference sources.

NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.
NASA JPLJet Propulsion Laboratory / Solar System Dynamics
Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.

Quick facts

Type: Moon
Orbits: Jupiter

Provenance & sources

review 2026.1

Asteria Scientific Review Process · verification: sourced · accurate

High evidenceconfirmed
Europa, a Galilean moon of Jupiter, has a young icy surface and strong evidence for a global subsurface ocean of liquid water beneath its ice shell.
Source: NASA Science · Public domain (US Government work)
- NASA Planetary Fact Sheet, Planetary Fact Sheet

Reviewed by the internal Asteria Scientific Review Process — not an external institutional review. See the evidence framework and authority dashboard.

Scientific citations

Real, source-backed references — primary papers first, then datasets and institutional sources. Formatted through the citation engine; nothing is fabricated.

Institutional pageEuropa — NASA Solar System Exploration

NASA

Cite (APA / BibTeX)

NASA (n.d.). Europa — NASA Solar System Exploration. NASA. https://science.nasa.gov/

@misc{cite:nasa-moon-europa,
  title        = {Europa — NASA Solar System Exploration},
  organization = {NASA},
  year         = {n.d.},
  url          = {https://science.nasa.gov/},
  note         = {NASA overview of Europa.}
}

Quality & authority

63%

Reviewed

Completeness: Complete
Source coverage: Complete
Citation coverage: Complete
Relationship coverage: Complete
Review coverage: Complete
Image coverage: None

Data from the NASA Planetary Fact Sheet & JPL (public domain). See source quality.

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Sources

Facts on this topic will be cited from these primary and reference sources.

NASANational Aeronautics and Space Administration

Mission data, planetary science, space telescopes, and public-domain imagery.

Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.

NASA JPLJet Propulsion Laboratory / Solar System Dynamics

Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.

NASA (n.d.). Europa — NASA Solar System Exploration. NASA. https://science.nasa.gov/ @misc{cite:nasa-moon-europa, title = {Europa — NASA Solar System Exploration}, organization = {NASA}, year = {n.d.}, url = {https://science.nasa.gov/}, note = {NASA overview of Europa.} }