Object holder and lithographic apparatus

A moveable substrate table to support a substrate, the substrate table comprising:

• a support body having a support surface configured to hold the substrate on the substrate table;
• an opening adjacent an edge of the support surface;
• and
• a channel attached to the support body and in fluid communication with the opening via a passageway, wherein the channel is at least essentially thermally decoupled from the support body and from the passageway so that a thermal load in material defining the channel is essentially prevented from being transmitted to the support body and to the passageway.