Willem de Sitter was born #OTD in 1872. He used Einstein’s relativity to show that our universe is expanding, which Edwin Hubble later confirmed.
Also #OTD ,
NASAHubble
observed the center of our galaxy. What did Hubble see on your day? https://go.nasa.gov/4iUAyH...
https://go.nasa.gov/4iUAyH...
Also #OTD ,
NASAHubble
observed the center of our galaxy. What did Hubble see on your day? https://go.nasa.gov/4iUAyH...
https://go.nasa.gov/4iUAyH...
7 months ago
