ELI5: Explain Like I'm 5

Apollo–Soyuz

Ok kiddo, let's talk about Apollo and Soyuz.

You know how we have a lot of countries on our planet? Well, some of those countries sent people to space a long time ago. Two of those countries were the United States and the Soviet Union (which doesn't exist anymore).

In 1975, the leaders of those two countries decided to do something really cool. They wanted to show the world that even though their countries had a lot of differences, they could still work together on important things like space travel. So, they decided to plan a mission where American astronauts would fly a spaceship called Apollo, and Soviet cosmonauts would fly a spaceship called Soyuz, and they would dock their spaceships in space.

Now, this docking thing might sound easy, but it's actually really hard. It's like trying to connect two Lego sets together in mid-air. It takes a lot of planning, math, and precision. But the people who designed Apollo and Soyuz were really smart, so they made it work.

On July 15, 1975, the Apollo spaceship launched carrying three American astronauts. A few hours later, the Soyuz spaceship launched carrying two Soviet cosmonauts. The two spaceships met up in space and docked together, which was a big deal because it was the first time two different spaceships from different countries had ever docked together.

The cosmonauts and astronauts then opened up the hatches between their spaceships, which was also a big deal because it was the first time people from different countries had ever been in the same spacecraft. They shook hands, chatted in different languages, and even exchanged gifts like medals and flags.

After two days of working together, the spaceships undocked and went back to their own countries. Even though the mission was short, it was a really important moment for the world because it showed that even during a time of really tense relations, people from different countries could still come together and work towards a common goal.