Given a text passage, come up with an appropriate title for it. The title should accurately represent what the main focus of the passage is. The title of a passage may be present in the first few sentences of the passage and/or be referred to multiple times in the passage. The title should be 1-5 words long.

[EX Q]: The Horsehead Nebula ( also known as Barnard 33 ) is a dark nebula in the constellation Orion . The nebula is located just to the south of the star Alnitak , which is farthest east on Orion 's Belt , and is part of the much larger Orion Molecular Cloud Complex . The nebula was first recorded in 1888 by Scottish astronomer Williamina Fleming on photographic plate B2312 taken at the Harvard College Observatory . The Horsehead Nebula is approximately 1500 light years from Earth . It is one of the most identifiable nebulae because of the shape of its swirling cloud of dark dust and gases , which bears some resemblance to a horse 's head when viewed from Earth .
[EX A]: Horsehead Nebula

[EX Q]: Mauna Loa 's most recent eruption occurred from March 24 to April 15 , 1984 . No recent eruptions of the volcano have caused fatalities , but eruptions in 1926 and 1950 destroyed villages , and the city of Hilo is partly built on lava flows from the late 19th century . Because of the potential hazards it poses to population centers , Mauna Loa is part of the Decade Volcanoes program , which encourages studies of the world 's most dangerous volcanoes . Mauna Loa has been monitored intensively by the Hawaiian Volcano Observatory since 1912 . Observations of the atmosphere are undertaken at the Mauna Loa Observatory , and of the Sun at the Mauna Loa Solar Observatory , both located near the mountain 's summit . Hawaii Volcanoes National Park covers the summit and the southeastern flank of the volcano , and also incorporates Kīlauea , a separate volcano .
[EX A]: Mauna Loa

[EX Q]: Little Caesars Arena is a multi-purpose arena in Midtown Detroit . Construction began on April 24 , 2015 , following a formal groundbreaking ceremony on September 25 , 2014 . Opened on September 5 , 2017 , the arena , which cost $862.9 million to construct , succeeded both Joe Louis Arena and The Palace of Auburn Hills as the homes of the Detroit Red Wings of the National Hockey League ( NHL ) and the Detroit Pistons of the National Basketball Association ( NBA ) , respectively .
[EX A]:
Little Caesars Arena