How to Observe Hubble's Variable Nebula (NGC 2261), an ever changing nebula
![Image](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1tQBxc6jIqN-vG3ox-eSCTA9fyVs-gdmzTuljBugnTcWIYggoPoLVk2N2CCokHrT8eP647L2rOMM-7o5lGSU8iP9P6ZkTf7LTIqnBXiv9tajUhp9Vk_A5dI_ZbUP6gC_jCgcr7dmGPY7vzvIBJCO_F-w250D-H_GRDlFCiU5b9VF6e1TvN3J9mBxg/s320/NGC%202261.png)
When viewing deep-sky objects, most appear static within the timescales of human observers. However, there are exceptions, such as supernovas exploding in distant galaxies, eclipsing binaries and the expanding crab nebula.