In modern astronomy, Sirius is a binary system composed of a main sequence star (Sirius A) with a spectral type of A0 or A1, and a faint white dwarf with a spectral type of DA2 (Sirius B). The distance between the two varies between 8.2 and 31.5 astronomical units, with a period of every 50 years.
The ancient Egyptians already knew that Sirius had a companion star, which was extremely advanced astronomical knowledge at that time. French scientists conducted research on the primitive tribes of Dogan in the early 20th century and found that there is a story of Sirius in the myths and legends of the Dogan people, suggesting that Sirius has a very special meaning to ancient civilizations.
If Sirius becomes our sun, it will be the only light source in our night sky, and our moon will reflect its dazzling light. This will be a brand new astronomical era, and our calendars, culture, and even biological clocks will be changed as a result.
Although the scenario of Sirius replacing the Sun is just a hypothesis, it reminds us that every change in the universe can have a profound impact on our lives. We should continue to explore the universe and learn about those distant stars, because their stories are also our own.
