« on: 25/09/2021 22:08:21 »
Tidal forces wouldn't effect the answer significantly. The Roche limit( as measured in multiples of the primary's radius) is dependent on the relative densities of the bodies.
Anyway, other articles consider the journey toward the sun to be over in about 65 days but that seems to be because they reckon the tidal forces from suns gravity would rip the planet apart before we even reach the outer edges of the sun.
The Earth is some 4 times denser than than the Sun. If we treat the Earth as a fluid body, this puts the Roche limit at 1.55 Sun radii from the center of the Sun our just over 1/2 Sun radius above its surface.
Treated as a rigid body, the Roche limit ends up at ~0.8 the Sun's radius, or under the Sun's surface. The actual Roche limit for the Earth will likely fall somewhere between.
But even if we put it at 1/2 the Sun's radius away, the Earth is just ~350,000 km from the surface, and will be moving close to its final speed of over 616 km/sec. In other words, it is only around 10 min from surface impact.
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