What is black hole? How do we know that stars and galaxies are billions of years old? What is the difference between stars and planets?
| Author | Gleen Murphy |
| Publisher | Macmillan Publishers |
| Year of publication | 2010 |
| Number of pages | 264 |
| Language | English |
| Format | Paperback |
| ISBN-10 | 1447251369 |
| ISBN-13 | 9781447251361 |
| Illustrator | Nick Stearn |
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