1. SHAPES OF GALAXIES ALL THE SHAPES, SIZES AND FACTS OF GALAXIES! BY HELSBY HIGH SCHOOL

2. INTRODUCTION - BETH GALAXIES = STARS (MILLIONS AND BILLIONS) PLANETS DARK MATTER. DIFFERENT TYPES OF GALAXIES INCLUDING : SPIRALELLIPTICALIRREGULARLENTICULAR

3. SPIRAL GALAXIES – SARITA Spiral galaxies are rich in gas and dust Spiral galaxies are rich in gas and dust The spiral structure is associated with active star-forming regions. The spiral structure is associated with active star-forming regions. Disked shaped with spirals Disked shaped with spirals Often have bright bulges in the centre Often have bright bulges in the centre Contain interstellar gas, nebulae, star forming regions, open clusters and globular clusters Contain interstellar gas, nebulae, star forming regions, open clusters and globular clusters

4. IRREGULAR GALAXIES – JAY Irregular galaxies – IRREGULAR! Ellipse or Spiral??????? All Irregular galaxies are different! How can you tell if it’s Irregular or not then? Are they symmetrical? How are they formed? Are Irregular galaxies mistaken? What are those blobs? What are different ones called?

5. ELLIPTICAL GALAXIES - ALASTAIR Elliptical galaxies are epsoidal in shape. They contain no spiral arms. They have very little interstellar gas or dust. They are often found in rich clusters of galaxies. They appear to be yellow-red unlike spiral galaxies which appear blue. Elliptical galaxies contain a similar amount of stars to spiral galaxies. They are known for their old, red stars. In general the centres of these galaxies emit high amounts of blue ultraviolet light.

6. CARTWHEEL GALAXIES - NATHAN How are they formed? Head on collusion How fast do they expand? 200,000mph What are the blue dots? Lots of unborn stars

7. HUBBLE SEQUENCE -REID The Hubble “Tuning Fork” diagram starts from the left. Developed by Edwin Hubble in 1936. Classification of galaxies.

8. DARK MATTER - TOM Most matter is dark Most matter is dark Can’t be detected Can’t be detected Can’t be seen directly Can’t be seen directly Indirectly from movements of astronomical objects Indirectly from movements of astronomical objects Needed by gravity Needed by gravity Large scale structures Large scale structures

9. CONCLUSION - WILL These are mainly the only galaxies we know of. For all we know there may be many more! There are millions of galaxies and lots of ways of interpreting them! Thank you for listening. I hope you learnt something and we hope you enjoyed it. Just Imagine What Might Be Out There?