Used the preset sky "brooding" and changed the settings so there wasn't any haze nor cloud cover.
step 2 of 6
I edited the sky even more in the Sky Lab to make more stars and comets.
step 3 of 6
I made a tunnel by creating a positive and negative cylinder and grouping them--resizing the inner cylinder.
step 4 of 6
In the Material Lab, I changed settings to make the tunnel somewhat transparent and somewhat reflective.
step 5 of 6
I used an image I made myself as the Image Texture for the Material.
step 6 of 6
I had to reposition the camera view a lot to get the "eye" of the camera inside the tunnel and rotated the camera until I got the right view of space. Because of the camera position/angle, the wireframe is a bit hard to see.