There are patterns in the star positions that are very obvious, and which the observer would have heard of had they been visible from Earth. For example:

• A large area of the sky, in a regular geometric shape, with no stars at all.
• Stars arranged in several regular parallel lines, with similar changes in brightness along each line.
• Stars that flash on and off like fire-flies.
• Stars that change in colour over periods of only a few minutes.

There are patterns in the star positions that are very obvious, and which the observer would inescapably have heard of had they been visible from Earth. For example:

• A large area of the sky, in a regular geometric shape, with no stars at all.
• Stars arranged in several regular parallel lines, with similar changes in brightness along each line.
• Stars that flash on and off like fire-flies.
• Stars that change in colour over periods of only a few minutes.