The dub ( diastolic sound) occurs when part of the heart relaxes and the aortic and pulmonary valves close. A heart murmur is an extra sound, such as a whooshing, caused by irregular blood flow through the heart valves. Heart murmurs can be heard through a stethoscope and are often detected during routine physical examinations. If your heart murmur is related to more serious problems, your doctor may refer you to a cardiologist (heart specialist).
On July 20, 1969, Apollo 11 astronaut Neil Armstrong became the first man to walk on the moon. Armstrong is pictured here, shortly after collecting a sample of lunar dust and rocks. At his feet is the handle for the sample collection tool.
Russia won the first round of the space race when it launched the first man to orbit the Earth, Yuri Gagarin, in 1961. Armstrong and Buzz Aldrin Jr, however, fulfilled John F Kennedyâs promise to reach the Moon by the end of the decade, landing there on July 20, 1969, with Nasaâs Apollo 11.The Soviet Union subsequently cancelled its lunar programmes. spacecraft will âconduct a demonstrative manned circumlunar test flight with the subsequent landing of cosmonauts on [the Moonâs] surface and their return to Earthâ by 2030, according to a leaked strategy document from Russiaâs space agency, Roskosmos.