The name of the nascent exoplanet is PDS 70b and is a few times larger than the planet Jupiter.[218][219][220] The koala genome is completely sequenced.[221] 10 July – Researchers at the University of Michigan show that increased atmospheric CO2 reduces the medicinal properties of milkweed plants that protect monarch butterflies from disease.[222] 11 July – Scientists report the discovery in China of the oldest stone tools outside of Africa, estimated at 2.12 million years old.[223] 12 July The IceCube Neutrino Observatory announces that they have traced a neutrino that hit their Antarctica-based research station in September 2017 back to its point of origin in a blazar 3.7 billion light-years away.