“ The matter in the universe is made out of positive energy. However, the matter is all attracting itself by gravity. ”
Stephen Hawking, A Brief History of Time (1988). copy citation
| Author | Stephen Hawking |
|---|---|
| Source | A Brief History of Time |
| Topic | gravity energy |
| Date | 1988 |
| Language | English |
| Reference | |
| Note | |
| Weblink | https://archive.org/stream/ABriefHistoryOfTimeByStephenHawking/A%20Brief... |
