The first 10_-43 seconds of the universe's history is called? Planck Era true Gamow Era false Hubble Era false Hoyle Era false Single Which of the following elements already existed 380,000 years after the Big Bang? Helium true Carbon false Silicon false Uranium false Single What Kuiper Belt Objects did the New Horizons space probe visit? Triton and Pluto false Pluto and Quaoar false Pluto and Arrokoth true Pluto and Eris false Single What type of decay does the isotope Plutonium-238 undergo to produce Uranium-234? Alpha decay true Beta decay false Gamma decay false Positron emission false Single The currently-accepted version of the Solar Nebular Theory was formulated by which scientist? Immanuel Kant false Pierre Simon de Laplace false George Gamow false Viktor Safronov true Single What is the name of the first exoplanet to be discovered? Dimidium true Brahe false Finlay false Hypatia false Single Where is the Kuiper Belt located? Beyond the Oort Cloud false Beyond the orbit of Neptune true Between the orbits of Mars and Jupiter false Within the orbit of Mercury false Single The telescope that first detected the Cosmic Microwave Background is located in which country? United Kingdom false Brazil false United States true Japan false Single Who coined the term 'Big Bang' to describe the now most-accepted theory on the formation of the Universe? George Gamow false Edwin Hubble false Georges Lemaître false Fred Hoyle true Single What is the name of the spacecraft that made humanity's first soft landing on a comet? Rosetta false Philae true Stardust false Vega false Single