A cluster of sunspots 15 times bigger than Earth could send a solar storm our way as early as Saturday

• A cluster of sunspots 15 times the size of Earth rolled into view.
• These have been fizzing with activity and could send solar weather toward Earth as early as Saturday. 
• Space weather is mostly harmless, though scientists are looking out for a rare once-a-century superstorm.

A cluster of sunspots has rolled into view of Earth and may send a solar storm our way as early as Saturday.

The cluster includes about a dozen sunspots that are around 125,000 miles wide— about 15 times bigger than our planet, Space.com reported.