- Space Invaders (allthetropes.org)
The Trope Maker that spawned a thousand other Shoot’Em Ups, Space Invaders debuted in 1978. Although Pong had started the industry, this game revolutionized it, virtually launching The Golden Age of Video Games, establishing or codifying many of the tropes used in later games, such as Video Game Lives, and a separate score counter for high scores.
- Double Cluster (Wikipedia)
The Double Cluster (also known as Caldwell 14) consists of the open clusters NGC 869 and NGC 884 (often designated h Persei and χ (chi) Persei, respectively), which are close together in the constellation Perseus. Both visible with the naked eye, NGC 869 and NGC 884 lie at a distance of about 7,500 light years in the Perseus Arm of the Milky Way galaxy.