There’s a saying ‘the world isn’t all cupcakes and rainbows’, which implies that life isn’t always carefree and joyful. Real life consists of real struggles and hardships. Yes, rainbows are often associated with joys, success, hope and coloring one’s life with its vibrant vividness. And that’s true! Rainbows are indeed a delight for one’s eyes and do exemplify hope and joy. However, the Nordic people in ancient times, had a very different idea as to what rainbows signify. The Norse myths have quite a detailed description of the significance of rainbows.
According to legend, the gods built a spectacular arching bridge to connect the world of men- Midgard, to their own realm, Asgard, called the Bifrost. The gods traverse the Bifrost every time they have special business in the world of men. In most interpretations, the Bifrost is a great rainbow that carves a perfect path across the sky. The Prose Edda (an old Norse textbook recounting Norse legends) written by Snorri Sturluson, states that the Bifrost shimmers with three colors which are more than just a decorative element.
Sturluson claims that the red line in the bridge is a stripe of burning fire- main defense of Asgard against the jotnar, or giants,(the gods’ greatest enemies). The red fire that burns on the Bifrost provides protection from the ice giants of Niflheim and the mountain giants of Jotenheim. The threat of burning fire is enough to keep them from ever attempting to cross the magical bridge.
The Bifrost also has a god dedicated to its defense-Heimdall. His hall, Himinbjorg, is positioned near the end of the Bifrost (the rainbow) in Asgard. From there, he can keep a constant watch on the bridge to make sure no one attempts to reach Asgard without the approval of the gods.
This, along with the difficulty in finding the bridge’s end in Midgard, keeps wayward humans from trying to reach the home of the gods. Men, however, are not the greatest threat to Asgard.
Prophecies in Norse mythology claim that the Bifrost will be assaulted once, at the onset of Ragnarok. When Heimdall sees this, he will sound his horn,Gjallarhorn, to alert the other gods. This marks the official beginning of Ragnarok- the end of the world when war is waged between giants and the gods.
Many ancient religions used their myths to explain natural phenomena. Things that are easily understood by modern science were believed to be the actions of gods or spirits in the past. The Poetic Edda specifies that Thor (God of Thunder) does not ride across the bridge like the other gods. Instead, he wades through boiling hot water beneath the bridge, which is said to burn with flames. Today we know that rainbows appear when the sun shines after a rainstorm because of the refraction of light through water droplets in the air. Ancient people, however, would have to imagine a reason for the connection between the storm god and the colors in the sky.
Scholars interpret the story of Thor wading through the hot water as symbolizing the heat and humidity that are felt when the sun comes out after a storm. When this happens, the rainbow appears to burn in the sun’s heat.
So, in summary, the Bifrost was a passage built by gods to serve the purpose of connecting their realm, Asgard, to man’s realm, Midgard. According to the Prose Edda, the Bifrost is a rainbow and has a fiery red line of defense against the jotnar or giants. Heimdall is the god responsible for guarding the bridge, seeing that no unwanted passenger crosses it. Heimdall will alert the gods with his horn, Gjallarhorn, when Ragnarok approaches, and the war between the gods and giants begins, or as you would call it, doomsday!