Want an assessment
My work can be found at https://codepen.io/Earl_Karf/pen/MWeMwwo
Hello @Earl_Karf, you’re doing great! 
Your HTML is really well structured, but few things need to be fixed.
-
The name of every planet is the heading of their respective rows. So give them the scope of row. Example -
<th scope="row">Pluto</th>. Do this for every planet. -
In line 87, the scope should be
rowgroup, notrow -
The
Dwarf Plantesheading should spread over two columns, not one. So you need to update your code like this -
<th scope="rowgroup" colspan="2">Dwarf Planets</th>
<th scope="row">Pluto</th>
Have a great day!