Question

What are the five main galaxy types in the Hubble sequence, and what are their respective abbreviations?

Answer 1

The five main galaxy types in the Hubble sequence are Elliptical (E), Lenticular (S0), Spiral (S), Barred Spiral (SB), and Irregular (Irr).

Step-by-step explanation:

There are five main galaxy types in the Hubble sequence:

• E - Elliptical: These galaxies are characterized by their elliptical shape and lack of structure. They are denoted by the letter 'E.'
• S0 - Lenticular: These galaxies have a disk-like shape but lack spiral arms. They are denoted by the letters 'S0.'
• S - Spiral: These galaxies have a central bulge and spiral arms. They are denoted by the letter 'S.'
• SB - Barred Spiral: These galaxies have a central bar-shaped structure and spiral arms. They are denoted by the letters 'SB.'
• Irr - Irregular: These galaxies have irregular shapes and lack any defined structure. They are denoted by the abbreviation 'Irr.'

So, the five main galaxy types in the Hubble sequence and their respective abbreviations are:

1. Elliptical (E)
2. Lenticular (S0)
3. Spiral (S)
4. Barred Spiral (SB)
5. Irregular (Irr)