A long time ago, a smart man named Albert Einstein made a big mistake. He thought the universeuniverse/ˈjuːnɪvɜːrs/L1宇宙；所有星球、星星和空间的总和everything that exists, including all stars, planets, and space was not moving. He added a number to his math. He called it the cosmological constantconstant/ˈkɒnstənt/L1常数；一个在数学中不改变的数字a number in math that does not change.
Later, he found out he was wrong. The universeuniverse/ˈjuːnɪvɜːrs/L1宇宙；所有星球、星星和空间的总和everything that exists, including all stars, planets, and space is getting bigger. It is getting bigger faster and faster. Scientistsscientists/ˈsaɪəntɪsts/L1科学家；研究自然和世界的人people who study the world and find new things saw this in 1998.
Now, new scientists from Brown University have an idea. They say the shapeshape/ʃeɪp/L1形状；某物的外形或样子the form or outside look of something of spacespace/speɪs/L1空间；地球之外的地方，没有空气the area outside Earth where stars and planets are keeps the constant small. This is good because big numbers would stop stars and planets from forming. The scientists are happy with this new answer.
