Anonymous
Anonymous asked in Science & MathematicsAstronomy & Space · 1 month 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 ?

Relevance
• 1 month ago

Try more reading -- and less thinking .

• Anonymous
1 month ago

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

• Manuel
Lv 4
1 month ago

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

• 1 month ago

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.

• 1 month 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.

• 1 month 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
1 month 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 .

• 1 month 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.

• 1 month 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

• david
Lv 4
1 month 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).