A massive sunspot flared for the sixth time this week in the sun's largest active region spotted on the star in 24 years, according to NASA. 

The solar flares are intense bursts of radiation in the sunspots, which cause the biggest explosive events in the solar system. This morning's X-flare (the most powerful type of solar storm) caused a radio blackout on Earth, as CS Monitor reported. 

If aimed at Earth, X-flares could be dangerous - especially for astronauts and spaceships. It could disrupt radio and communication signals, although it cannot injure people on the Earth's surface because the atmosphere serves as protection from the radiation, CS Monitor reports. 

"Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, but when intense enough - they can disturb the atmosphere in the layer where GPS and communications signals travel," NASA tells Daily Mail. 

The sun spot where the flares are occuring this week is almost as big as Jupiter (about 14-times larger than Earth), reports Daily Mail.