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NASA has listed an asteroid almost as tall as San Francisco's iconic Golden Gate Bridge on its "close approaches" page.
The space agency says the 2020 PM7 is due for a fly-by on Tuesday and measures up to 200 metres.
That makes it nearly as big as the height of Golden Gate Bridge, which measures 227m in height.
Although there is an extremely low risk of it hitting Earth, it has been listed on NASA's near-Earth Objects (NEOs) Close Approaches page.
That means space scientists will monitor the huge space rock as it passes by.
It is estimated to fly past as a whopping speed of 18,633mph.
But it is predicted the rock will pass our planet at 1,783,862 miles away.
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It comes after one asteroid, 2020 SW, passed by Earth on Thursday closer to us than some weather satellites.
The rock was only just discovered last week, but passes Earth at an estimated distance of 0.07 lunar distance away (LD) from Earth, which is around 17,000miles.
It measured up to 9.7m, according to estimations.
By contrast the 2020 RA2, which was listed for a fly-by on Wednesday, hurtled past at 18.36 LD, which is around 4,384,431 miles away.
Before 2020 SW flew past, the Virtual Telescope Project said in a statement: "On September 24, 2020, the near-Earth Asteroid 2020 SW will have an extremely close, but safe, encounter with us, coming at about 27,000 km from the Earth, 7 percent of the average lunar distance.
"The near-Earth asteroid 2020 SW, discovered by the MLS on September 18, 2020 and announced the following day by the Minor Planet Centre, has an estimated diameter in the range 4.3 – 9.7 meters (source: Nasa/JPL)."
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