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Transcript of Galaxies
A collection of stars, gas, and dust held together by gravity
a cloud of gas and dust that forms from an exploding star and from which stars can form (think ... beginning and end)
little gas & dust
rich in gas & dust
bar through center
thought to be temporary during transition from barred spiral to regular spiral, may result from gravitational tug from the stars within the galaxy or that of a nearby galaxy
scientists have been able to
accurately measure the nucleus of our galaxy along with the movement of the stars in our galaxy. Based on this data, scientists believe the Milky Way Galaxy is a Barred Spiral
No noticeable shape
abundant gas & dust
may form during galaxy interactions
astronomers classify galaxies
by their SHAPE
Our galactic neighborhood ...
The Local Group
spherical to the shape of a football
low gas & dust
massive black hole at center
First classified by Edwin Hubble ...
Gravity is a force of attraction that can bring galaxies together
under certain conditions (distance/mass)
interactions between galaxies can cause a change in shape
Measuring the Universe’s 'Exit Door': For the First Time, an International Team Has Measured the Radius of a Black Hole