(availability varies by region). To get the 4K version, ensure you have the "Ultra HD" tier of the respective service. Digital Purchase: You can buy or rent the 4K UHD version on Apple TV (iTunes) Google Play
This is the safest, highest-quality method. Most major platforms offer a free trial period during which you can access their entire 4K library. Interstellar Free 4k
Unlike a black hole, a wormhole is theoretical. The film visualizes a sphere suspended in space, not a hole. This is a correct representation of a three-dimensional tunnel in a higher dimension; a wormhole would appear as a sphere because it distorts light from the destination point in all directions. (availability varies by region)
While there is no official "Free 4K" feature for Interstellar Most major platforms offer a free trial period
Experience the Cosmos: How to Watch Interstellar in 4K Christopher Nolan’s Interstellar
As they descended onto Proxima b's surface, the crew encountered an unexpected surprise: a vast, interconnected network of alien structures, sprawling across the planet's surface. The xenobiologist, Dr. Singh, detected signs of microbial life emanating from the structures, which sparked a flurry of excitement and curiosity.