Tycho is a prominent lunar

Moon

The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...

 impact crater

Impact crater

In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...

 located in the southern lunar highlands, named after the Danish astronomer Tycho Brahe

Tycho Brahe

Tycho Brahe , born Tyge Ottesen Brahe, was a Danish nobleman known for his accurate and comprehensive astronomical and planetary observations...

 (1546-1601). To the south is the crater Street

Street (crater)

Street is a lunar impact crater located just to the south of the prominent ray crater Tycho. Street lies within the skirt of high-albedo ejecta from Tycho, and it is more heavily worn than its younger and larger neighbor. There are several smaller craters joined to the western rim, as well as two...

; to the east is Pictet

Pictet (crater)

Pictet is a lunar impact crater located just to the east of the larger and more prominent impact crater Tycho. The high-albedo rays and ejecta from Tycho lie across Pictet and spread far to the east and in other directions. Pictet is older than Tycho and is somewhat worn by past impacts. The...

, and to the north-northeast is Sasserides

Sasserides (crater)

Sasserides is the remains of a lunar crater in the southern part of the Moon. It is located less than one crater diameter to the north of the prominent crater Tycho, and west of Orontius. To the north is Ball....

. The surface around Tycho is replete with craters of various sizes, many overlapping still older craters. Some of the smaller craters are secondary craters formed from larger chunks of ejecta

Ejecta

Ejecta can mean:*In volcanology, particles that came out of a volcanic vent, traveled through the air or under water, and fell back on the ground surface or on the ocean floor...

 from Tycho.
Tycho is a relatively young crater, with an estimated age of 108 million years (Ma), based on analysis of samples of the crater rays recovered during the Apollo 17

Apollo 17

Apollo 17 was the eleventh and final manned mission in the American Apollo space program. Launched at 12:33 a.m. EST on December 7, 1972, with a three-member crew consisting of Commander Eugene Cernan, Command Module Pilot Ronald Evans, and Lunar Module Pilot Harrison Schmitt, Apollo 17 remains the...

 mission.