It is difficult to say how much bigger the Milky Way galaxy is to a nebula, as nebulae can vary greatly in size. Some nebulae, such as the Orion Nebula, are relatively small and only a few light-years across. Others, such as the Sagittarius B2 nebula, are much larger and can be hundreds of light-years across. The Milky Way galaxy, on the other hand, is about 100,000 light-years across. So, while some nebulae may be larger than the Milky Way, most are smaller.