This is a paid asset, but now you can download Next-Gen Planets Free.
Detail this asset from Unity Store: Original Link
Next-Gen Planets v1.2 (Latest version)
— Compatible with Legacy/LWRP/URP/HDRP —
DEMO : Open in your browser
This asset includes a pack of 20 different planets with a customizable shader. Modify it to your will or adapt it for close and far views.
The shader works without the need of a Light. Set the GameObject you want as a light source and the planet will be lit according to it.
The whole pack is also mobile ready (With textures downsizing)
In addition to the planets you get acces to a space ambient loop music crafted with love, the Sun and a background sky full of stars as seen in the demo.
Technical informations :
– Textures up to 4096px
– 1 Draw call per planet alone (1 more for atmosphere)