Retrograde motion for Mars, illustration. Because the Earth (blue) moves faster in its orbit than Mars (red) does around the Sun (yellow), Mars appears at times to move backwards across the sky relative to the background of stars (top) when viewed from Earth. This apparent backwards movement is known as retrograde motion. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Hardy, David A. |
Bildgröße: | 2487 px × 4213 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |