I want to show a more realistic starry sky. May I ask what rules or theoretical basis do you customize the skybox? Or can you tell me where the resources of the skybox can be downloaded?

1. A concise explanation of the problem you’re experiencing.

How to customize starry sky pictures or download resources.

2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

Shows a more realistic HD starry sky and is able to identify some constellation locations.

4. The Cesium version you’re using, your operating system and browser.

cesium 1.6.0
chrome 74


Could some one answer this question please?

Basically, what you want to do is make your own skybox – the starry sky is just six large images forming a cube around your globe. Create whatever six images you want, then load them in as a new skybox. more info here: https://cesium.com/docs/cesiumjs-ref-doc/SkyBox.html