On this day:

1964 NASA launches Mariner 4, the first spacecraft to make a flyby of Mars & the spacecraft was the first one to send images of a planet back to Earth.

1967 First pulsar observed by graduate student Jocelyn Bell and her advisor Antony Hewish at Cambridge University

1975 East Timor declared its independence from Portugal

Born on this day:

1820 Friedrich Engels, German philosopher

Gone on this day:

1954 Enrico Fermi, Italian physicist, Nobel Prize laureate

1968 Enid Blyton, English author