The Egg Nebula is also known as CRL 2688. These are two photographs of the same object taken by two different cameras aboard the Hubble Space Telescope.
On the left is a photo of the Egg Nebula as it appears with a standard visible light camera. On the right is an image of the same nebula as it appears in infrared light with Hubble's Near Infrared Camera and Multi-Object Spectrometer (NICMOS). Since infrared light is invisible to humans, the NICMOS image has been assigned colours to distinguish different wavelengths: blue corresponds to starlight reflected by dust particles, and red corresponds to heat radiation emitted by hot molecular hydrogen.
