Galaxy information

Andromeda Galaxy

Collect requests now to prioritize a future galaxy catalog built only from defensible observations.

Back to galaxy reviews
Observational image — source details pendingSpiral galaxy
ClassificationSpiral galaxy
DistanceApprox. 2.5 million light-years
DiameterAbout 220,000 light-years
Estimated starsRoughly one trillion stars (estimate)
Other life probability68%
Catalog nameMessier 31 (M31)
LocationLocal Group
DistanceAbout 2.5 million light-years
Current planet entriesNo confirmed detailed entries here yet

Travel reality

Distance at human spacecraft speeds

At light speed2.5 million years299,792 km/s

Physical reference only; a spacecraft with mass cannot reach light speed.

At 10% of light speed25 million yearsHypothetical 29,979 km/s

No operational human spacecraft can approach this cruise speed.

At Parker Solar Probe peak3,899.03 million yearsAbout 692,000 km/h

Parker reaches this record near the Sun; it is not an interstellar cruise capability.

At Voyager 1 speed44,087.13 million yearsAbout 17 km/s relative to the Sun

A practical comparison with a spacecraft on an interstellar trajectory.

Life potential

How likely is other life somewhere in Andromeda Galaxy?

Andromeda is a massive spiral galaxy with a huge stellar population, making additional life somewhere inside it plausible on broad statistical grounds.

Editorial probability of other life68%
Very plausible somewhere

Why this score?

  • It is a large spiral galaxy rich in stars.
  • Large galaxies provide many opportunities for planet formation.
  • We lack a detailed planet census there compared with the Milky Way.

Uncertainty is much higher than for the Milky Way because individual planets are difficult to study.

Why it matters

Andromeda is the nearest major galaxy to the Milky Way and a natural target for a future large-scale catalog.

What we can observe

Astronomers can resolve large stellar populations and star-forming regions, but individual Earth-like planets remain far beyond current confirmation methods.

Catalog policy

Rate the Earth will not invent individual planets. Requests are collected now so verified future discoveries can be prioritized when data becomes available.

Image source details pending