Showing all posts tagged: milkomeda

When galaxies collide, coming to the night sky in four billion years

4 June 2012

Several billion years hence our galaxy, the Milky Way, will collide with galactic neighbour Andromeda, and form a new entity some are calling Milkomeda. This NASA image depicts key steps in the process, and if nothing else will transform the night sky into a visual spectacle.

Not that anyone will probably be around to think about it anyway, but the night sky will have far less appeal once the merger is complete. The bright white haze (in the last frame) that will eventually take the place of the Milky Way (first frame) looks a little bland to me.

Via NASA Science.

Originally published Monday 4 June 2012.


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Colliding galaxies, an insight into Milkomeda’s formation?

12 July 2009

Eventually our galaxy will collide (or, if you prefer, merge) with the Andromeda galaxy forming a new body some are already calling Milkomeda.

But this photo of four galaxies colliding — by the way — at speeds of up to two million miles (or 3.2 million kilometres) an hour, may be indication of what to expect when Milkomeda does form.

Originally published Sunday 12 July 2009


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The chances of colliding with a star are a million to one

18 February 2009

My recent mentions of the eventual merger/collision of the Milky Way and Andromeda galaxies, giving rise to “Milkomeda”, has prompted some reader questions about the likelihood of a star from Andromeda colliding with the Sun, during the “merger”.

One thing to remember is the collision is billions of years away, should it even happen, but the chances of stars from either galaxy colliding are extremely remote given the astronomical distances between them:

As with all such collisions, it is unlikely that objects such as stars contained within each galaxy will actually collide, as galaxies are in fact very diffuse – the nearest star to the Sun is in fact almost thirty million solar diameters away from the Earth. (If the sun were scaled to the size of an American quarter, 24.26 mm (0.955 in), the next closest quarter/star would be 700 km (475 miles) away.)

Originally published Wednesday 18 February 2009.


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Lost in space, the final days of the Solar system

11 February 2009

We already know it is likely our galaxy, the Milky Way, will merge (a subtle way of saying collide actually) with our, for now, distant neighbour Andromeda, forming an entity called “Milkomeda”.

It is also possible however that our Solar system will see out its days completely alone somewhere in the cosmos, if it is somehow ejected from the Milky Way during the Andromeda “merger”…

The future is never certain, though, and alternative endings can be written. There is a slim chance that the whole solar system, sun and all, might be thrown out of Milkomeda intact. Out in the emptiness of intergalactic space, the planets would be safe from marauders. There they could continue to circle our darkening star until their energy is eventually sapped and they spiral inwards. One by one as they hit the black-dwarf sun, a few final flares will rage against the dying of the light.

Originally published Wednesday 11 February 2009.


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When galaxies collide well be living in Milkomeda

28 January 2009

Our galaxy, the Milky Way, is destined to “merge” with our giant neighbour, Andromeda, in about five billion years.

Currently both galaxies are approaching each other at speeds of 120 kilometres (km) per second, and “Milkomeda” is one name that has been dubbed for the combined entity.

Before the collision occurs though both galaxies will fly past each other twice, occurrences that could possibly result in the Sun, and its family of planets, being drawn into the Andromeda system.

There is also a remote 3% chance that the Sun will jump ship and defect to the Andromeda galaxy during the second close passage. “In the night sky, we would then see the Milky Way from a distance,” says Loeb.

Just to put the distances into some perspective, moving at a rate of 120 km per second means covering about 3.8 billion km per year. The planet Neptune is some 4.46 billion km from the Sun, so we are talking about some very, very, vast amounts of space here.

Originally published Thursday 28 January 2009.


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