Benjamin Carr, Ph.D. 👨🏻💻🧬<p><a href="https://hachyderm.io/tags/DarkMatter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DarkMatter</span></a> formed when fast particles slowed down and got heavy, new theory says<br>The extremely low-energy particles they suggest make up dark matter would have a unique signature on the cosmic microwave background, the leftover radiation from the <a href="https://hachyderm.io/tags/BigBang" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>BigBang</span></a> that fills all of the <a href="https://hachyderm.io/tags/universe" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>universe</span></a>. "Dark matter started its life as near-massless relativistic particles, almost like light," says Robert Caldwell, a professor of <a href="https://hachyderm.io/tags/physics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>physics</span></a> and <a href="https://hachyderm.io/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> and the paper's senior author.<br><a href="https://phys.org/news/2025-05-dark-fast-particles-heavy-theory.html" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">phys.org/news/2025-05-dark-fas</span><span class="invisible">t-particles-heavy-theory.html</span></a></p>