The closest star to Earth (other than the Sun) is over 4 light-years away. Even at light speed, a round trip would take 8 years.
How to Play: Guess if the star on the right is FARTHER or CLOSER from Earth than the one on the left.
Name A
Name B
Top 10 Closest Visible Stars
Star distances in light-years (ly): the distance light travels in 1 Earth year. The Sun is 8.3 light-minutes (0.0000158 ly).
| # | Name | Distance (light-years) | Unit |
|---|---|---|---|
| 1 | Andromeda Galaxy (closest stars) | 2,537,000 | ly |
| 2 | Large Magellanic Cloud | 163,000 | ly |
| 3 | Galactic Center (Sagittarius A*) | 26,000 | ly |
| 4 | Eta Carinae | 7,500 | ly |
| 5 | Crab Nebula (Pulsar) | 6,500 | ly |
| 6 | Deneb | 2,615 | ly |
| 7 | Orion Nebula | 1,344 | ly |
| 8 | Rigel | 864 | ly |
| 9 | Antares | 555 | ly |
| 10 | Betelgeuse | 548 | ly |
Cosmic Distances
Proxima Centauri at 4.24 ly is the closest known star to the Sun. It has at least one confirmed exoplanet (Proxima b) in its habitable zone.
Light from Sirius (8.6 ly) takes 8.6 years to reach Earth. We see Sirius as it was 8.6 years ago. Most familiar stars are seen years to centuries in the past.
Andromeda Galaxy at 2.5 million light-years is the nearest large galaxy. Light leaving Andromeda when humans first walked upright is just arriving now.
Frequently Asked Questions
Closest star (other than Sun)?
Proxima Centauri at 4.24 light-years.
How many light-years to the next galaxy?
Andromeda Galaxy at ~2.5 million light-years.
How fast does light travel?
299,792 km/sec. One light-year is ~9.46 trillion km.
Could we ever travel to other stars?
With current tech, ~80,000 years to Proxima Centauri. Theoretical concepts (fusion drives, light sails) could reduce to centuries.
Note: Star distances in light-years per Hipparcos and Gaia parallax measurements.
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