Anonymous
Anonymous asked in Science & MathematicsAstronomy & Space · 4 weeks ago

are asteroids proof that not everything that has mass in space is a sphere ?

if an asteroid can be a random entity with edges and flat surfaces surely this opens up the whole debate on whether our earth is nothing as its being made out to be ( i.e a close sphere ).

what if the earth is a big smooth pebble shape ?

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  • 3 weeks ago

    Try more reading -- and less thinking . 

  • Anonymous
    3 weeks ago

    Earth is not a sphere, and we don't need asteroids to figure this one out.

  • Manuel
    Lv 4
    4 weeks ago

    Sufficient mass (and of course, gravity) will be the deciding factor(s) in an objects shape in space. Be safe.

  • Big asteroids are roughly spherical.   Ceres, for example.

    The transition from "small enough to be any shape" to "big enough that it must be spherical" is several tens of kilometers in size (depending on how accurately spherical you want).  It's a matter of strength of material vs. self-gravity.  In a big enough thing of any material, gravity is going to win over material strength.

    About the best you can do for a non-spherical object is to make it out of granite --- a lightweight, very strong rock.  (That's why the biggest mountains on Earth are made of granite.)  Any lump of granite more than 100 km in size is going to have to be approximately spherical.

    Of course flat-Earth enthusiasts think that gravity doesn't work like that.

    For them, gravity is the force holding the disk onto the back of the Giant Tortoise.

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  • 4 weeks ago

    Objects less than approximately 250 miles/400 kilometers diameter have insufficient gravitational force to pull themselves into a spherical shape.  The largest known Solar System object to deviate significantly from a sphere is Hyperion, one of Saturn's moons.

  • 4 weeks ago

    Any body big enough that gravity holds it together must form a sphere. At least, almost spherical. Any other shape would be a mountain thousands of miles high. That would not be stable and it would fall. 

    An asteroid is small. Its not held together by gravity. It is held together by electromagnetic forces between atoms, just like any small rock on earth. As long as the rock is strong enough, it can be any shape. 

  • garry
    Lv 5
    4 weeks ago

    think you havent heard of gravity , you know what keeps use going around the sun and not shooting off ..thinks you need grade 5 science .

  • 4 weeks ago

    Only objects over a few hundred kilometres in diameter have enough gravity to pull themselves into approximate spheres, with the exception of neutron stars.  And Earth is not perfectly spherical, it's just so close that you can't tell it isn't by looking at it from space.

  • 4 weeks ago

    Not at all

    And it is an overal main shape

    Many Objects because of their spin have flattened poles

    And Earth since the collision of Theia 4.5 billion years ago has been left an Oblate Spheroid

    Even Mars has a Dent, the Tharsis Region where a Texas sized Asteroid Struck

    And Uranus got knocked right over on its side

    It is Gravity's way of reaching Equalibrium to form a Sphere

    If a theoretical Planet began as a Cube Gravity would begin rounding the corners till it eventually forms a Sphere

    Theoretrically  any body over 500 kms diameter forms a sphere

    Most Asteroids have been broken off something

    3.8 Billion years ago we had the Late great bombardment

    A theoretical Planetisimal was smashed to pieces

    It has been named Baptista and the Pieces have been retraced back to the one place

    The Asteroids have been named Baptistinas

    Two of which passed Earth's way to come to a rest

    One Hit the Moon leaving the Tycho Crater

    And the other 65 Million years ago, where the Gulf of Mexico is leaving the Chixalub Crator and causing a Mass Extinction

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  • david
    Lv 4
    4 weeks ago

    Actually, The Earth is a pear shaped spheroid. It's atmosphere (including it's oceans) tends to smooth out the rough edges a bit. Given enough (undisturbed) time, all celestial objects will assume a roughly spherical shape. A sphere is what evenly distributes counter balancing forces of gravity and pressure (PV=NRT). 

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