Grade 6 Science Study Guide
Test Date: Friday, October 10th
Term
Definition
Galaxy
a large group of stars, dust and gas
held together by gravity
Hubble’s Law
States the further a galaxy is, the
faster it is moving away from us
3 shapes of galaxies
Irregular, elliptical, spiral
Cosmic background radiation
Was discovered on a radio telescope.
This form of radiation appears as a
flow and is believed that this form of
radiation is left over from the big bang
theory
Big Bang theory
Planetisimal
Dark matter
dark energy
Light spectrum
Universe
The universe formed in an instant,
billions of years ago in an enormous
explosion
Small asteroid like bodies
is matter that does not give off
electromagnetic radiation
a mysterious force causing the
expansion of the universe to
accelerate
The breaking down of light from
celestial objects into ROYGBV
All of space and everything in itpeople, stars, planets
Redshift
The red light which helps us located
the position of a galaxy- the red
comes from ROYGBV
Hubble’s Law
Was proof that we live in an
expanding universe – it laid the
foundation for the Big Bang Theory
Space
A portion or area – the amount of
area that is available for use
Planets
Formed when planetisimal collide
and stick together
sun
Center of the solar system; medium
sized star
Solar nebula
A large cloud of dust and gas, which
formed our solar system
proton
A particle that has a positive electric
charge- found in the nucleus of the
atom
Neutron
No charge, nucleus
Electron
A particle with a negative chargenot in the nucleus
Nucleus of the atom
Central part of the atoms that contain
the protons and neutron
Atom
Building blocks of matter
Radiation
A process by which energy comes to
earth by form of waves
Energy
The ability to do work
spectroscopy
The study of light from celestial bodies
Nuclear fusion
The process which fuels the sun-this
happens when hydrogen and helium
atoms collide
The only electromagnetic waves from
the electromagnetic spectrum that
we can see
Visible light
Light spectrum
Visible spectrum light we can see
Edwin Hubble
Made many observation that showed
the universe to be expanding
The Steps of the Big Bang Theory
 Believed the universe began about 14 million years ago
 14 billion years ago our universe was inside a bubble thousands
of times smaller than a pin head
 It was hot and dense
 It suddenly exploded
 The universe was born
 Time, space, and matter all began with the big bang