PROFILEStar
A natural powerhouse
In its core, hydrogen nuclei combine to form helium. This process, called nuclear fusion, releases energy that eventually reaches space as light and heat.
An active star
The Sun has a magnetic field and an activity cycle. Sunspots, flares and clouds of particles can affect the space around Earth.
FACTS TO EXPLORE
AGEabout 4.5 billion years
LOCATIONStar
Values are rounded. AU means astronomical unit. NASA source ↗
