As a result, rocks that record its earliest history have not been found and probably no longer exist.
Nevertheless, there is substantial evidence that the Earth and the other bodies of the Solar System are 4.5-4.6 billion years old, and that the Milky Way Galaxy and the Universe are older still.
Although she's super supportive of her boyfriend on social media, even posting a picture of herself and their beautiful daughter, Jasmine Johnson, watching Johnson at Wrestle Mania, Hashian keeps out of the spotlight.
Radioactivity was discovered in 1896 by French physicist Henri Becquerel.
Up next, the hunky star will surprise audiences by singing (!!
I also can't wait to see if Dwayne Johnson's longtime girlfriend will join him at the awards show and walk the carpet alongside him. Despite their lengthy relationship, you might not have heard of her.
Johnson and Hashian have been together for the almost 10 years — which is very long in Hollywood — but they keep their relationship pretty private, only showing a few pics together on their social media accounts.
You have to respect the happy couple for keeping their relationship out of the limelight for the most part, since a lot of celebrities oversaturate their social media with relationships that don't even last.
These radioactive elements constitute independent clocks that allow geologists to determine the age of the rocks in which they occur.