Consider the following pairs:Objects in SpaceDescriptionCepheidsGiant clouds of dust and gas in spac

Question

Consider the following pairs:Objects in SpaceDescriptionCepheidsGiant clouds of dust and gas in spaceNebulaeStars which brighten and dim periodicallyPulsarsNeutron stars that are formed when massive stars run out of fuel and collapseHow many of the above pairs are correctly matched?

Accepted Answer

Cepheids, also called Cepheid Variables, are stars which brighten and dim periodically. This behavior allows them to be used as cosmic yardsticks out to distances of a few tens of millions of light-years.Nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form. For this reason, some nebulae are called star nurseries.Pulsars are rotating neutron stars observed to have pulses of radiation at very regular intervals that typically range from milliseconds to seconds. Neutron stars are formed when a massive star runs out of fuel and collapses.