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One of Saturn’s moons, Mimas, looks like the Death Star and its heat signature resembles a Pac-Man.

Milky Way Galaxy Fact

The Milky Way’s central core contains a supermassive black hole. It is commonly referred to as Sagittarius A*. It contains the mass of about 4.3 million Suns.

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The Andromeda galaxy, M31, is moving towards the Milky Way at a speed of 250,000 miles per hour and is predicted to collide, and eventually merge with our own galaxy in 4 billion years. The series of images above illustrates this merging of the two galaxies.

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Two scientists with the Harvard–Smithsonian Center for Astrophysics stated that when, and even whether, the two galaxies collide will depend on Andromeda’s transverse velocity. Based on current calculations they predict a 50% chance that in a merged galaxy, the Solar System will be swept out three times farther from the galactic core than its current distance. They also predict a 12% chance that the Solar System will be ejected from the new galaxy sometime during the collision. Such an event would have no adverse effect on the system and the chances of any sort of disturbance to the Sun or planets themselves may be remote.

Excluding planetary engineering, by the time the two galaxies collide the surface of the Earth will have already become far too hot for liquid water to exist, ending all terrestrial life; that is currently estimated to occur in about 3.75 billion years due to gradually increasing luminosity of the Sun (it will have risen by 35–40% above the current luminosity).

The galaxy that will be the result of the collision is nicknamed Milkomeda.

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Milky Way Galaxy Fact

The Milky Way has grown by merging with other galaxies through time. It is currently acquiring stars from a very small galaxy called the Sagittarius Dwarf Spheroidal, as well as gobbling up material from the Magellanic Clouds.

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Milky Way Galaxy Fact

The Milky Way moves through space at a velocity of about 552 kilometres per second (343 miles per second) with respect to the Cosmic Microwave Background radiation.

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Milky Way Galaxy Fact

The stars, gas and dust of the Milky Way all orbit the centre at a rate of about 220 kilometres per second. This constant rate for all stars at different distances from the core implies the existence of a shell of dark matter surrounding our galaxy.

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Black Holes Fact

The “point of no return” around a black hole is called the “event horizon”. This is the region where the gravity of the black hole overcomes the momentum of material spinning around it in the accretion disk. Once something crosses the event horizon, it is lost to the pull of the black hole.

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Milky Way Galaxy Fact

Our galaxy will collide with Andromeda Galaxy in about 5 billion years. Some astronomers refer to our two galaxy as a binary system of giant spirals.

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Kuiper Belt Fact

The largest Kuiper Belt objects are Pluto, Quaoar, Makemake, Haumea, Ixion, and Varuna. These are often also referred to as Trans-Neptunian Objects (TNOs).

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Asteroid Belt Fact

The Asteroid Belt is often referred to as the “Main Belt” to distinguish it from other groups of asteroids such as the Lagrangians and Centaurs.

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Asteroid Belt Fact

Gravitational influences can move asteroids out of the Belt.

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Asteroid Belt Fact

Some asteroids in the Belt are quite large, but most range in size down to pebbles.

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Asteroid Belt Fact

Asteroid Belt objects are made of rock and stone. Some are solid objects, while others are orbiting “rubble piles”.

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The Little Gem Nebula

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Asteroid Belt Fact

The belt is estimated to contain between 1.1 and 1.9 million asteroids larger than 1 kilometer (0.6 mile) in diameter, and millions of smaller ones.

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Asteroid Belt Fact

The Asteroid Belt is located in an area of space between the orbits of Mars and Jupiter. That places it between 2.2 and 3.2 astronomical units (AU) from the Sun.

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Asteroid Belt Fact

The belt is about 1 AU thick. The average distance between objects in the Asteroid Belt is quite large. If you could stand on an asteroid and look around, the next one would be too far away to see very well.

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