<prompt> Hlalosa hore na ke hobaneng ha keketseho ea bokahohle e ntse e eketseha ka sekhahla.nan  <response>: Instruction in English: Explain why the expansion of the universe is accelerating. . Response in English: The expansion of the universe is accelerating due to a mysterious force known as dark energy. About 5 billion years ago, the universe underwent a dramatic transition from decelerating to accelerating expansion. This is thought to have been caused by the increasing dominance of dark energy over gravity. Dark energy is a hypothetical form of energy that permeates all of space and exerts a repulsive force, driving the acceleration of the universes expansion. While the exact nature of dark energy is still not fully understood, it currently accounts for approximately 68 of the total mass-energy content of the universe.One of the leading theories for dark energy is the cosmological constant, proposed by Einstein. The cosmological constant describes dark energy as a uniform density of energy that fills space and is responsible for the observed acceleration.Another theory suggests that dark energy could be a new, exotic form of energy called quintessence, which is thought to vary in time and space.Researchers continue to study and explore the exact nature of dark energy, and its role in the accelerating expansion of our universe. . Response in Sesotho: Katoloso ea bokahohle e ntse e eketseha ka sekhahla ka lebaka la matla a mohlolo a tsejoang e le matla a lefifi. Hoo e ka bang lilemo tse limilione tse likete tse 5 tse fetileng, bokahohle bo bile le phetoho e tsotehang ho tloha ho ho fokotseha ho ea ho ho hōla ka potlako. Ho nahanoa hore sena se bakiloe ke ho eketseha ha matla a lefifi holima matla a khoheli. Matla a lefifi ke mofuta o inahaneloang oa matla o kenang sepakapakeng kaofela me o sebelisa matla a nyonyehang, a tsamaisang ho ata ha bokahohle. Le hoja semelo sa matla a lefifi se ntse se e-so utloisisoe ka botlalo, hajoale e nka hoo e ka bang 68 ea kakaretso ea matla a mangata a bokahohleng. E ngoe ea likhopolo tse ka sehloohong tsa matla a lefifi ke cosmological constant, e sisintsweng ke Einstein. The cosmological constant e hlalosa matla a lefifi e le matla a tshwanang a matla a tlatsang sebaka mme a ikarabella bakeng sa ho potlakisa ho hlokometsweng. Khopolo e ngoe e fana ka maikutlo a hore matla a lefifi e ka ba mofuta o mocha, o sa tloaelehang oa matla o bitsoang quintessence, oo ho nahanoang hore o fapana ka nako le sebaka. Bafuputsi ba ntse ba tsoela pele ho ithuta le ho hlahloba sebopeho se nepahetseng sa matla a lefifi, le karolo ea ona ho potlakisang katoloso ea bokahohle ba rona. 