15 Things You Didn’t Know About Earth

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From lakes that actually explode to a twin planet that crashed into Earth once upon a time, we count 15 facts about the little blue planet we like to call home

15 – 24 Hours,

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  • The common saying goes that there’s only 24 hours in a day – but that isn’t actually true, the Earth spins on its axis for 23 hours and 56 minutes
  • The reason we add an extra 4 minutes is because the distance in which we’ve orbited the sun is so great that it takes some extra time just for us to face the sun again
  • And since the Earth is spinning slower and slower every few million years, in around 250 million years a typical day will actually last 1.5 hours longer

14 – Gravity Glitch,

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  • There is an area in Canada known as Hudson Bay with uneven mass – and where there’s uneven mass, there’s uneven gravity
  • Long-since melted glaciers once lined the area, but now they’re gone and the burden of gravity remains in both the ice sheets and underneath the Earth’s crust, leading to lower gravity here than anywhere else on Earth
  • Don’t get too excited though – it’s not like you’ll be able to start moon-jumping around Canada – the difference in gravity is only a 0.005% reduction, so minute that you can’t even feel it

13 – Photo,

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  • 65 miles above the atmosphere, the first ever photo of Earth was taken with a camera carried by a V-2 missile in 1946 – it snapped a frame every second and a half and managed to survive re-entry
  • The scientists who reviewed the footage were beyond ecstatic, jumping up and down with joy that they could finally see their own world in a still image
  • Likewise in 1967 the first full-on, colour Earth image was taken by the DODGE satellite

12 – Ocean Salt,

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  • Most of the salt in our ocean comes from rocks on the shores, mainly because rainwater which is naturally acidic breaks down the rock and distributes their components into the water
  • Seawater salt is so dense that if you were to dissolve all the oceans in the world and spread the remaining salt over all the land on earth, you’d have a 500 foot thick salt layer coating EVERYTHING

11 – Rocks Can Walk,

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  • There exists a flat lakebed in Death Valley known as Racetrack Playa, in which rocks physically move from place to place
  • And it’s not just small rocks, but ones weighing tens or hundreds of pounds – the theory goes that these ice-encrusted rocks are flooded by meltwater from the hills
  • This makes everything nice and slick which, along with a hard breeze, allows the rock to travel

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One thought on “15 Things You Didn’t Know About Earth

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