Atom & Cosmos

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tetraneutrons

NO PROTONS ALLOWED  The collision of two varieties of helium nuclei at a Japanese lab produced beryllium nuclei and tetraneutrons, nuclei with four neutrons but no protons. This illustration depicts the number of protons and neutrons but not their actual positions within each nucleus.

Soviet stamp

MOON VIEW  A 1966 Soviet Union stamp depicts Luna 9 on the moon’s surface (left) and the first lunar images displayed on television (right). 

rocky planet

SOLID AS A ROCK  A planet about half the size of Neptune might be made of pure rock, making it larger than other known rocky planets (one illustrated).

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