Given a list of words and descriptions, categorize the words into two distinct groups.
Pluto — dwarf planet
Helium — chemical element
Uranus — planet
Titanium — chemical element
Group 1: Celestial Objects
- Pluto — dwarf planet
- Uranus — planet

Group 2: Chemical Elements
- Helium — chemical element
- Titanium — chemical element
Complete the following task based on the instruction and optional input provided.### Instruction:
Given a list of words and descriptions, categorize the words into two distinct groups.

### Input:
Pluto — dwarf planet
Helium — chemical element
Uranus — planet
Titanium — chemical element

### Output:
Group 1: Celestial Objects
- Pluto — dwarf planet
- Uranus — planet

Group 2: Chemical Elements
- Helium — chemical element
- Titanium — chemical element