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Dark matter is a hypothetical type of matter comprising approximately 27% of the mass and energy in the observable universe that is not accounted for by dark energy, baryonic matter, and neutrinos.

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a theoretical form of energy postulated to act in opposition to gravity and to occupy the entire universe, accounting for most of the energy in it and causing its expansion to accelerate.

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a small very dense star that is typically the size of a planet.

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1. a theoretical form of energy postulated to act in opposition to gravity and to occupy the entire universe, accounting for most of the energy in it and causing its expansion to accelerate.

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A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—including particles and electromagnetic radiation such as light—can escape from inside it.

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a planet is getting eaten by a black hole

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This is an image of a phenomenon rather than an object. We see a pulse of light from a star's outburst traveling through the surrounding space, illuminating material ejected by the star at a much earlier epoch. This is one of a series of "snapshots" of the ongoing phenomenon that took place over many months, and provided an unusual opportunity to follow a rapidly changing subject and the rare ability to tease out its full 3D structure.

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These moons are known as the Galilean moons and they are called Io, Europa, Ganymede and Callisto

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This is an image of a phenomenon rather than an object. We see a pulse of light from a star's outburst traveling through the surrounding space, illuminating material ejected by the star at a much earlier epoch. This is one of a series of "snapshots" of the ongoing phenomenon that took place over many months, and provided an unusual opportunity to follow a rapidly changing subject and the rare ability to tease out its full 3D structure.

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The Whirlpool Galaxy, also known as Messier 51a, M51a, or NGC 5194, is an interacting[7] grand-design[8] spiral galaxy with a Seyfert 2 active galactic nucleus[9] in the constellation Canes Venatici.

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The Ring Nebula is the glowing remains of a Sun-like star

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two galaxies pass close enough to gravitationally disrupt each other's shape.

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The Whirlpool Galaxy is an interacting grand-design spiral galaxy

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The Milky Way is the galaxy that contains our Solar System.[18][19][20][nb 1] Its name "milky" is derived from its appearance as a dim glowing band arching across the night sky whose individual stars cannot be distinguished by the naked eye.

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The Milky Way is the galaxy that contains our Solar System. Its name "milky" is derived from its appearance as a dim glowing band arching across the night sky whose individual stars cannot be distinguished by the naked eye.

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The Milky Way is the Galaxy that contains our Solar System

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These moons are known as the Galilean moons and they are called Io , Europa, Ganymede and Callisto.

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The last phase of a dying sun, it a sun that has lost its light and heat.

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The remnant gases of a dying star with a new star forming from the old gases.

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The closest galaxy to our own - 2.51 million light years away.  Contains one trillion stars.  The Milky Way is destined to collide with Andromeda in 4 billion years.