Extragalactic cosmic ray Extragalactic cosmic ray Extragalactic cosmic rays are very-high-energy particles that flow into the Solar System from beyond the Milky Way galaxy. The energies these particles possess are in excess of 10 eV. Unlike solar or galactic cosmic rays, little is known about the origins of extragalactic cosmic rays. This is largely due to a lack of statistics: only about 1 extragalactic cosmic ray particle per square meter per year reaches the Earth's surface (see figure). There are many ideas about which processes may be responsible for cosmic rays with such high energies. In the 'bottom-up' approach, cosmic rays gain more
Beyond the Core Beyond the Core Beyond the Core: Expand Your Market Without Abandoning Your Roots is a non-fiction book by American business consultant Chris Zook. This is the second book in his "Profit from the Core" trilogy, followed by "Unstoppable" released in 2007. "Beyond the Core" argues that businesses must grow to survive—but only one in five strategies for growth succeeds. In the previous book, "Profit from the Core", Zook explains how to grow profitably by concentrating on and harvesting the full potential in the core business. But if the core business fails to provide new growth, managers should stick to an