What is the Cosmic Microwave Background?

Cosmic microwave background radiation covers the entire universe, but many parts of this image of the cosmic microwave background radiation are covered by the Milky Way. Scientists will use precise data analysis to strip out information about the microwave background radiation of the entire universe, and hope to draw from it the detailed process of the expansion of the universe after the Big Bang.

Cosmic microwave background radiation pattern

On March 21, 2013, the European Space Agency released the most accurate cosmic microwave background radiation pattern at the beginning of the universe, drawn by data returned from the "Planck" space probe. The European Space Agency released this 50-megapixel cosmic microwave background radiation panorama at its headquarters in Paris, France. The displayed graphics show that within the pattern of the oval edges, dense blue and brown light dots represent radiation temperature fluctuations. This picture shows the universe after 380,000 years of the Big Bang.

In addition to well-verified the standard model of the universe with unprecedented accuracy, this figure also reflects some differences from existing universe theories, amending people's previous understanding. According to data collected by the "Planck" probe, scientists have a new understanding of the components of the universe. The proportion of ordinary matter and dark matter in the universe is higher than previously assumed, and the dark energy is believed to cause the universe to accelerate its expansion. Mysterious power is less than expected, accounting for less than 70%.
In addition, the Hubble constant reflecting the expansion rate of the universe is also corrected to 67.15 km / (second · million second gap), that is, every one million second gap between a galaxy and the earth (a gap of about 3.26 light per second Years), its speed away from the earth increases by 67.15 kilometers per second. This data means that the age of the universe is about 13.82 billion years. ^[2]