惠而浦（也称为梅西耶51号（M51）是一个双臂螺旋星系，位于距离我们银河系25至3700万光年之间。它最初由查尔斯梅西耶于1773年发现，并得到了绰号“The Whirlpool”由于其完美的结构，类似于水中的漩涡。它有一个小的，看起来很漂亮的伴星系，叫做NGC 5195.观测证据表明，惠而浦及其同伴在数十亿年前相撞。结果，星系形成了巨大的星系，长长的，细腻的尘埃穿过手臂的尘埃。它的心脏上还有一个超大质量的黑洞，还有其他较小的黑洞和中子星散落在它的旋臂上。当惠而浦及其同伴相互作用时，他们微妙的引力舞会在两个星系中发出冲击波。与其他星系碰撞并与星星混合时，碰撞也会产生有趣的结果。 ，这个动作将气体和尘埃云挤压成密集的物质结。在这些区域内，压力迫使气体分子和尘埃更紧密地结合在一起。重力迫使更多物质进入每个结，最终，温度和压力变得足够高，以点燃恒星物体的诞生。数万年后，一颗恒星诞生了。将它旋转到惠而浦的所有旋臂上，结果就是一个充满星星诞生区和炎热的年轻恒星的星系。在星系的可见光图像中，新生恒星出现在蓝色的星团和团块中。其中一些恒星如此巨大，以至于它们只能持续数千万年才能爆发出灾难性的超新星爆炸。
The Whirlpool (also known as Messier 51 (M51) is a two-armed spiral galaxy that lies somewhere between 25 to 37 million light-years away from our own Milky Way. It was first discovered by Charles Messier in 1773 and got the nickname of “The Whirlpool” due to its beautifully wound-up structure that resembles a vortex in water. It has a small, blobby-looking companion galaxy called NGC 5195. Observational evidence suggests that the Whirlpool and its companion collided billions of years ago. As a result, the galaxy is bristling with star formation and long, delicate-looking streamers of dust threading through the arms. It also has a supermassive black hole at its heart, and there are other smaller black holes and neutron stars scattered throughout its spiral arms. When the Whirlpool and its companion interacted, their delicate gravitational dance sent shock waves through both galaxies. As with other galaxies that collide and mingle with stars, the collision has interesting results. First, the action squeezes clouds of gas and dust into dense knots of material. Inside those regions, the pressure forces the gas molecules and dust closer together. Gravity forces more material into each knot, and eventually, the temperatures and pressures get high enough to ignite the birth of a stellar object. After tens of thousands of years, a star is born. Multiply this across all the spiral arms of the Whirlpool and the result is a galaxy filled with star birth regions and hot, young stars. In visible-light images of the galaxy, the newborn stars show up in blue-ish colored clusters and clumps. Some of those stars are so massive that they will only last for tens of millions of years before blowing up in catastrophic supernova explosions.