Input (grade 7): No isotope of technetium has a half-life longer than 4.2 million years (98Tc), so its detection in red giants in 1952 helped bolster the theory that stars can produce heavier elements.
Output (grade 5): No isotope of technetium has a half-life longer than 4.2 million years (98Tc). This means that its detection in red giants in 1952 helped support the theory that stars can produce heavier elements.