to grow together
In science when something accretes, it gradually increases by steady addition of smaller parts.
asteroid
any of thousands of usu. irregularly shaped heavenly bodies
Ceres was the first asteroid that was discovered; it is also the largest.
birth
to cause or produce something
For years, I kept a notebook with ideas for birthing new inventions.
boundary
a real or imagined line that marks the edge or limit of something
The city boundaries are marked by the railroad tracks.
condense
to reduce something
He had to condense his speech because the audience was losing interest.
debris
remains of something
There was a lot of debris near the construction site.
detection
a discovery
After the detection of a mole in his arm, the man became worried that it might be cancer.
inhibit
to make an action or behavior difficult
Her lack of confidence inhibited her from getting a better job.
magnetic field
an area around a magnet or something magnetic, in which its power to attract objects to itself can be felt
Earth's magnetic field is approximately a magnetic dipole, with one pole near the north pole and the other near the south pole.
molecule
the simplest of a chemical substance, usually a group of two or more atoms
Two hydrogen atoms and one oxygen atom make up one water molecule.
predict
to say what will happen in the future
Fortune tellers say they can predict the future, but they usually not right.
protoplanetary disk
a rotating disk of dense gas surrounding a young newly formed star
Protoplanetary discs are rather cool.
protostar
any early stage in the formation of a star when an interstellar cloud of gas and dust starts to collapse but before nuclear synthesis has begun at its core
A protostar is surrounded by a dense cocoon of gas and dust that blocks visible light.
rotate
turn in a circle, especially around a fixed point
You have to rotate the handle 90 degrees in order to open the door.
solar system
the Sun, Earth, eight other planets, moons, comets, that move around the sun
The solar system fascinates even the youngest of children.
solidify
to make something definite
We solidified our plans to visit all the famous museums in the world.
speck
a tiny piece
The woman was obsessed about her house being clean and would not even tolerate a speck of dust.
spew
to come out or push out with force
Lava spewed out of the volcano.
strict
expecting rules to be followed
The mother gave her son strict orders to be home by midnight.
vast
wide in area
Traveling on the vast ocean reminded him of the trip he had taken as a child.
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