Question

Arrange the following events in space exploration in chronological order1. Humans orbited Earth.2. Sputnik I was launched into space.3. The first human stepped onto the moon.4. Explorer I was launched.

Answer 1

The events in space exploration in chronological order are: Sputnik I was launched, Explorer I was launched, Humans orbited Earth, and the first human stepped onto the moon.

Step-by-step explanation:

1. Sputnik I was launched into space in 1957.
2. Explorer I was launched in 1958.
3. Humans orbited Earth in 1961.
4. The first human stepped onto the moon in 1969.