May 07

Events - Science & Technology

1895day.year

In Saint Petersburg, Russian scientist Alexander Stepanovich Popov demonstrates to the Russian Physical and Chemical Society his invention, the Popov lightning detector—a primitive radio receiver. In some parts of the former Soviet Union the anniversary of this day is celebrated as Radio Day.

In 1895, Russian physicist Alexander Popov demonstrated a primitive radio receiver in Saint Petersburg, a landmark event now celebrated as Radio Day in Russia and former Soviet states.
On May 7, 1895, Alexander Stepanovich Popov presented his lightning detector—one of the earliest radio receivers—to the Russian Physical and Chemical Society in Saint Petersburg. The device detected electromagnetic waves caused by lightning strikes, showcasing the practical potential of wireless communication. Popov's demonstration laid the groundwork for modern radio technology and inspired further research into radio waves. Though contemporaries like Marconi were advancing similar inventions, Popov's work became a source of national pride in Russia. Each year, May 7 is commemorated as Radio Day in parts of the former Soviet Union, honoring this breakthrough. The celebration highlights Russia's contributions to the development of radio and its enduring scientific legacy.
1895 Saint Petersburg Alexander Stepanovich Popov lightning radio receiver Soviet Union Radio Day
1952day.year

The concept of the integrated circuit, the basis for all modern computers, is first published by Geoffrey Dummer.

Geoffrey Dummer published the first concept of the integrated circuit on May 7, 1952, laying the foundation for modern electronics.
On May 7, 1952, British radar engineer Geoffrey Dummer proposed the idea of the integrated circuit. His concept envisioned combining multiple electronic components on a single semiconductor substrate. Although his design would not be realized immediately, it inspired the later creation of practical microchips by Jack Kilby and Robert Noyce. The integrated circuit revolutionized electronics by dramatically reducing size, cost, and power consumption. It became the cornerstone of modern computers, telecommunications, and consumer devices. Dummer’s early insight paved the way for the digital age and global information technology.
1952 integrated circuit Geoffrey Dummer
1992day.year

Space Shuttle program: The Space Shuttle Endeavour is launched on its first mission, STS-49.

Space Shuttle Endeavour lifts off on STS-49, its inaugural mission to recover a stranded communications satellite.
STS-49 was the maiden flight of orbiter Endeavour, assembled to replace the Challenger fleet after the 1986 disaster. The crew of five astronauts was tasked with retrieving the runaway Intelsat VI-F3 satellite. After launch from Kennedy Space Center, Endeavour rendezvoused with the disabled satellite in orbit. The mission achieved the first-ever manual capture of a satellite in space during a complex EVA. Astronauts conducted extra-vehicular activities to secure and attach a new rocket motor to the satellite. Endeavour successfully deployed Intelsat VI into geosynchronous transfer orbit, restoring its communications function. STS-49 demonstrated novel techniques in on-orbit satellite servicing and EVA operations. Its success marked a significant milestone for the Space Shuttle program and future orbital repair missions.
Space Shuttle program Space Shuttle Endeavour STS-49