M87 is a giant elliptical galaxy in the Virgo Cluster, about 55 million light-years away. In Intro to Astronomy, it is a famous example of an active galaxy with a supermassive black hole and a powerful jet.
M87 is a giant elliptical galaxy in the Virgo Cluster, and in Intro to Astronomy it is one of the best real examples of how galaxies can stay bright without forming lots of new stars. It is also called Virgo A, and it sits about 55 million light-years from Earth.
What makes M87 stand out is its center. The galaxy contains a supermassive black hole with a mass of about 6.6 billion Suns. Material falling toward that black hole does not just disappear quietly. As gas spirals in, it heats up in the accretion flow and releases energy, which makes the galaxy’s nucleus active.
That active galactic nucleus, or AGN, powers a jet of high-energy particles that shoots outward for thousands of light-years. The jet is one of the clearest examples astronomers use when talking about how black holes can affect the space around them. The black hole itself is tiny compared with the whole galaxy, but the energy released near it can shape the galaxy’s appearance and radiation.
M87 is also useful because it is not a normal spiral galaxy like the Milky Way. It is an elliptical galaxy, so it has a smooth, rounder shape and little obvious dust or spiral structure. That matters in astronomy classes because galaxy shape, star formation, gas content, and black hole activity are often linked. Ellipticals like M87 usually have older stellar populations, while their centers may still be extremely energetic.
Another reason M87 gets so much attention is that astronomers can study it from multiple angles: visible light, radio observations, and high-energy data. The famous image of its black hole came from the Event Horizon Telescope, but even before that, the galaxy was already a major case study for AGN physics, jets, and mass in galaxies. When you see M87 in a lesson, think of it as a showcase galaxy for central black holes, energetic outflows, and the structure of a massive elliptical system.
M87 shows up whenever Intro to Astronomy moves from simple galaxy types into the physics of galactic centers. It gives you a real object to connect with AGN, accretion, and jet formation instead of treating those ideas like abstract vocabulary.
It also connects to how astronomers estimate and compare galaxy properties. M87 is massive, luminous, and packed with old stars, so it fits the profile of a giant elliptical galaxy in a dense environment like the Virgo Cluster. That makes it a useful comparison point when you are distinguishing spirals from ellipticals or talking about how galaxies evolve in clusters.
M87 matters for black hole discussions too. A central black hole does not just sit there as a label on a diagram. In M87, the black hole’s gravity drives accretion, accretion powers radiation, and that energy can launch a jet that stretches across the galaxy’s inner region. That chain of cause and effect is exactly the kind of reasoning astronomy classes love to test.
It also gives you a bridge into larger ideas about galaxy feedback, where energy from the nucleus can influence gas and future star formation. Even if M87 is not forming stars like a spiral galaxy, it still shows how galaxies are active systems, not static collections of stars.
Keep studying Intro to Astronomy Unit 24
Visual cheatsheet
view galleryElliptical Galaxy
M87 is a giant elliptical galaxy, so its smooth shape, older star population, and low visible dust fit that galaxy class. When you compare it to a spiral, M87 helps show why ellipticals usually look less structured but can still have very active centers.
Active Galactic Nucleus (AGN)
The bright core of M87 is an AGN powered by matter falling toward its central black hole. This connection is useful because it shows the basic AGN idea in a real galaxy, not just in a diagram.
Jet
M87’s jet is one of the clearest examples of a high-energy outflow from a galactic nucleus. In class, jets help you connect black hole accretion to observable structure, since the jet can be seen extending far from the center.
Central Bulge
A central bulge is a stellar concentration in a galaxy, but M87 goes beyond that because its center also contains a supermassive black hole and an AGN. Comparing the two helps separate ordinary dense galactic centers from truly active nuclei.
A quiz or short-answer question may show M87 in an image, a galaxy classification table, or a description of a bright core with a jet. Your job is to identify it as a giant elliptical galaxy with an active nucleus, then connect that activity to a supermassive black hole and accretion. If the question asks why a jet appears, trace the chain from infalling gas to energetic radiation and particle outflow.
On a problem set, you may be asked to compare M87 with a normal spiral galaxy or explain why ellipticals in clusters often contain old stars but can still host AGN. In discussion or a written response, use M87 as evidence that galaxy centers can strongly affect what astronomers observe across the whole system.
M87 is a giant elliptical galaxy in the Virgo Cluster, not a spiral like the Milky Way.
Its core contains a supermassive black hole that powers an active galactic nucleus.
The famous jet from M87 comes from energy released near the black hole, not from ordinary starlight.
M87 is a strong example of how a galaxy’s center can shape what astronomers observe at many wavelengths.
When you see M87 in class, connect it to galaxy structure, AGN, and jet physics.
M87 is a giant elliptical galaxy in the Virgo Cluster that contains a supermassive black hole and an active galactic nucleus. It is one of the most studied galaxies for showing how black holes can power bright cores and jets.
M87 is famous because it has a huge central black hole and a powerful jet that can be observed across multiple wavelengths. It is also the galaxy used in the first image of a black hole’s shadow, which made it a major reference object in astronomy.
No, M87 is an elliptical galaxy. That means it has a smoother, more rounded appearance and less visible dust and spiral structure than a spiral galaxy, even though its center is extremely active.
M87 is a classic AGN example because gas falling toward its supermassive black hole releases huge amounts of energy. That energy shows up as radiation from the nucleus and as a jet of particles extending outward.