Liberty Science Center is an interactive science museum and learning center located in Liberty State Park in Jersey City, New Jersey, United States. At its opening, it was the largest such planetarium in the Western Hemisphere and the world's fourth largest. The center, which opened in 1993 as New Jersey's first major state science museum, has science exhibits, numerous educational resources, and the original Hoberman sphere, a silver, computer-driven engineering artwork designed by Chuck Hoberman. History Liberty Science Center completed a 22-month, $109 million expansion and renewal project on July 19, 2007. The expansion added to the facility, bringing it to nearly . In December 2017, the Science Center opened the Jennifer Chalsty Planetarium, a 400-seat facility with a dome in diameter and an diameter screen, named for the benefactor who contributed $5 million towards the cost of construction. Larger than New York City's Hayden Planetarium, at its opening, it was the largest such planetarium in the Western Hemisphere and the world's fourth largest. Exhibits Liberty Science Center's permanent exhibitions include: Skyscraper! Achievement and Impact – Believed to be the most comprehensive exhibit on the topic of skyscrapers, which includes large models of some of the world's tallest buildings and explanations of various aspects of their construction, such as the physics of elevator operation, and test chamber that vets the strength of materials used to the buildings. Eat and Be Eaten – This exhibit of unusual live animals explores the predator-prey relationship, including vipers, puffer fish, cotton-top tamarins, brilliantly colored poison dart frogs, eusocial naked mole-rats and fungus culturing, leaf cutter ants. Communication is a 7,000-square foot exhibit that explores human communication, which can be experienced by the visitor via mobile devices, multimedia, and touch, through speech, writing and symbols. The exhibit also explains how technology plays a role in modern forms of communication. Traveling exhibitions – Various temporary exhibits "Mammoths and Mastodons: Titans of the Ice Age" used video installations, hands-on interactive displays, life-sized models and fossils to teach more about extinct mammals. The exhibit showcased Lyuba, the world's best-preserved woolly mammoth specimen. Titanic: The Artifact Exhibition featured over 100 authentic artifacts from the Titanic, which were set within replicas of cabins and other areas of the ship. The exhibit also allowed visitors to touch an "iceberg" to simulate how cold the water was when the ship sank. Rubik's Cube exhibition - Beyond Rubik's Cube opened to the public