|years:|| 2175 2176 2177 2178 2179 2180 2181
|decades:||2140s 2150s 2160s 2170s 2180s 2190s 2200s|
|centuries:||21st century - 22nd century - 23rd century|
- Terra Nova is admitted to the Federation.
- Friendship One transmits images of an apparent nebula (later determined to be the Nystrom Anomaly) back to Earth.