Jonathan McDowell is an astrophysicist at the Harvard-Smithsonian Center for Astrophysics, where he is part of the team that operates the Chandra X-ray Observatory. He maintains a website documenting the history of space exploration and has published a monthly newsletter – Jonathan’s Space Report – since 1998.Visit Jonathan McDowell
Most satellites in orbit (country)
According to figures obtained from Space-Track.org on 4 Jan 2019, 1,594 of the 4,872 satellites currently in Earth orbit belong to the United States government or US-based private companies. The world's next largest satellite operator is Russia, which has 1,520 satellites in orbit, followed by China with 332.