What type of celestial body could pierce an Earth like planet without loss of trajectory or minimal loss of speed?

What type of extraterrestrial body could successfully pierce through one side of an Earth-like planet, go through all strata, through the core, and then continuing through the strata and through the other side of said planet, then continuing into space, all while maintaining its trajectory and speed?

What would the size, composition, angle of penetration and velocity of said extraterrestrial body need to be for this happen? What type of damage would be seen on the planetary body that was impacted in this manner? And would said impact, penetrating the entire planetary body, have any long term effects such as gravity, quakes, or other phenomenon plague the planet, possibly causing it long term survivability, or even destabilization in the future.

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What type of celestial body could pierce an Earth like planet without loss of trajectory or minimal loss of speed?

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