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For decades, astronomers believed a collision between the Milky Way and Andromeda was an absolute certainty. However, the latest research from 2025 and 2026 has shifted this view significantly.
The Timeline: When will it happen?
According to the most recent data from the Gaia spacecraft and Hubble Space Telescope, the timeline and certainty of the collision are as follows:
• Original Prediction: A “head-on” collision in about 4 to 4.5 billion years.
• Revised 2025/2026 View: Recent simulations suggest the collision is no longer a “sure thing.” There is now estimated to be a 50-50 chance of a collision occurring within the next 10 billion years.
• If it happens: If the galaxies do merge, the process will take billions of years, eventually forming a new, giant elliptical galaxy often nicknamed “Milkomeda.”
The “Why”: Gravitational Attraction
The reason these two massive galaxies are moving toward each other is simple: Gravity.
1. Mutual Attraction: While the universe is expanding and pushing most galaxies away from each other, the Milky Way and Andromeda are part of the same “Local Group.” They are close enough (about 2.5 million light-years apart) that their mutual gravitational pull overcomes the expansion of space between them.
2. Radial Velocity: Andromeda is currently hurtling toward us at approximately 400,000 kilometers per hour (roughly 250,000 miles per hour).
3. The “Spoiler” Effect: The recent shift in certainty (the 50% chance) comes from better accounting for the gravitational influence of other nearby “satellite” galaxies, like the Large Magellanic Cloud and the Triangulum Galaxy. These smaller neighbors pull on both the Milky Way and Andromeda, which could potentially nudge them onto paths that lead to a near-miss rather than a direct hit.
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