Freedom is a complex issue to understand. We talk about religious freedom,political freedom and freedom to do what we want.

These artificial clouds are produced by releasing chemical compounds from high-altitude probes, typically at elevations between 80 and 400 kilometers above the Earth’s surface.

The multi-colored clouds are known as polar stratospheric clouds (PSCs) and look similar to auroras blazing in the sky. However, these rainbow clouds aren’t auroras as you might think.

“Even though the sun has set in Gale Crater, the clouds are high enough in the atmosphere that the sun still shines on them, making them seem to almost glow in the sky,” wrote Alex ...

Who needs drones and aliens when you can have this in the sky,' added a third. The spectacular display follows a similar 'spaceship' cloud appearing in Sydney. The bizarre natural phenomenon ...