Space, The Universe, and Everything Crossword Puzzle

QUESTIONS LIST:

• accretion : _ disk - diffuse material orbiting around a central body such as a protostar, a young star, a neutron star or a black hole.
• mass : a measure of the amount of matter in a body.
• molecule : a collection of atoms glued together by electromagnetic forces.
• matter : anything that has both mass and volume (i.e. takes up space).
• dark matter : matter that gives out no light and does not interact with the electromagnetic force, but whose presence can be inferred from gravitational effects on visible matter.
• inertia : the natural tendency of objects to resist changes in their state of motion.
• gravity : the force of attraction that exists between any two masses, whether they be stars, microscopic particles or any other bodies with mass.
• cmbr : anagram for cosmic microwave background radiation, which is the “afterglow” of the big bang, a microwave radiation which still uniformly permeates all of space at a temperature of around -270°ck.
• event horizon : a one-way boundary in space-time surrounding a black hole. any matter or light that falls through it can never leave, and any event inside it cannot affect an outside observer.
• magnetic : _ field - the field of force that surrounds a magnet.
• electron : a negatively-charged sub-atomic particle. it is an indivisible, elementary particle, and is usually to be found orbiting the nucleus of an atom.
• photon : a particle of light or other electromagnetic radiation, which has no intrinsic mass and can therefore travel at the speed of light.
• big bang : the huge “explosion” 13.7 billion years ago in which the universe is thought to have been created.
• light year : a convenient unit for measuring the large distances in the universe.
• black hole : the warped space-time remaining after the gravity of a massive body has caused it to shrink down to a point. it is a region of empty space with a point-like singularity at the center and an event horizon at the outer edge.
• galaxy : one of the basic building block of the universe. a massive system of stars, stellar remnants, gas, dust, and possibly a hypothetical substance known as dark matter, bound together by gravity.
• atom : the basic building block of all normal matter, consisting of a nucleus orbited by a cloud of negatively-charged electrons.