The Spanish word 'púlsar' comes directly from the English word 'pulsar', which was created in the 1960s to name a type of highly magnetized, rotating neutron star that emits beams of electromagnetic radiation from its magnetic poles. The English term is a blend of 'pulse' (from Latin 'pulsare' meaning 'to beat or strike') and 'star', referring to the star's characteristic pulsating radio emissions that are detected on Earth as regular intervals of radio waves.

Some related Spanish words include 'pulso' (pulse), 'pulsación' (pulsation), and 'pulsar' (the verb meaning 'to press or push'), all of which share the Latin root 'pulsare'. These words all relate to the concept of rhythmic beating or pressing, similar to how a pulsar star appears to 'beat' through its regular emissions of radiation.

English speakers can easily remember 'púlsar' by connecting it to the English words 'pulse', 'pulsate', and of course 'pulsar' itself, which are all derived from the same Latin root 'pulsare'. The connection between these words and the astronomical term is quite direct - just as your pulse beats rhythmically, a pulsar star appears to 'pulse' regularly as it rotates and emits beams of radiation.