Source: wikibot/space-by-year
= Space by year
{wiki=Category:Space_by_year}
"Space by year" usually refers to significant events and milestones in space exploration and astronomy organized chronologically. Here's an overview of some notable events in space history, year by year: \#\#\# 20th Century - **1957**: The Soviet Union launched **Sputnik 1**, the first artificial satellite. - **1961**: Yuri Gagarin became the first human to travel into space aboard **Vostok 1**.