Rocket Lab Rocket Lab launches its 3D-printed Electron rocket on a test flight from Māhia Peninsula in New Zealand. This is the first launch from New Zealand and the first from a private facility. Electron is 17 meters high, is intended for frequent launches of small payloads, and costs $5 million per liftoff. SpaceX's Falcon 9 stands at 70 meters, carries up to 22,800 kilograms to the ISS, and costs $62 million per launch.
Juno Results of the Juno mission are announced by NASA researchers, revealing new and unexpected information concerning Jupiter's poles, meteorology, and magnetic and gravitational fields.
2017 Atlantic hurricane season The U.S. National Oceanic and Atmospheric Administration says warm ocean waters could fuel an above-normal Atlantic hurricane season. The forecast calls for 11 to 17 named storms with five to nine hurricanes, warmer-than-average waters across the tropical Atlantic Ocean and Caribbean Sea, and a weak or nonexistent El Niño.
Russian interference in the 2016 United States elections Jared Kushner, son-in-law of and Senior Advisor to the President of the United States, is identified as a main focus of investigations into Russian ties by the Federal Bureau of Investigation.
Montana's at-large congressional district special election, 2017 Gianforte wins the election with over 50% of the vote to Quist's 44%. The political fallout if any is unknown as many voters cast unchangable absentee ballots before the incident took place.
Gianforte is officially charged with misdemeanor assault for allegedly body slamming reporter Ben Jacobs from "The Guardian"; the "Missoulian", "Billings Gazette", and "Independent Record" newspapers rescind their endorsements of Gianforte.
Voters in Montana pick between Republican Greg Gianforte and Democrat Rob Quist in the special congressional election to replace Ryan Zinke, who is now President Trump's Secretary of the Interior.
Immigration policy of Donald Trump The United States Court of Appeals for the Fourth Circuit refuses to reinstate Executive Order 13780 on the basis of religious discrimination, upholding the District Court for Maryland's March 7 ruling.
Territorial disputes in the South China Sea The USS Dewey sails within 12 nautical miles of the disputed Mischief Reef in the South China Sea.
United Kingdom–United States relations British police suspend sharing intelligence with the United States in connection with Monday's Manchester bombing attack for most of the day, after U.S. officials allegedly leak "sensitive information" to "The New York Times". British Prime Minister Theresa May emphasized the sensitive nature of said information when she met with U.S. President Donald Trump during their meeting at the NATO summit in Brussels. Trump calls for an investigation into the leaks.
Battle of Mosul The United States military reports that their investigation found 105 civilians were killed and 36 people are still missing from the bombing of a Mosul building on March 17.
Prime Minister Former Greek Prime Minister Lucas Papademos is injured when a booby-trapped package explodes inside his vehicle in Athens. Authorities report his injuries are not life threatening.