Getting lost in space is a scenario that ranges from immediate physical danger to a slow, inevitable demise depending on your location and equipment. Here is a breakdown of what would happen:

1. The Immediate Physical Effects
If you were floating in space without a pressurized suit, you would not explode or freeze instantly. Instead:

• Ebullism: Because of the lack of atmospheric pressure, the boiling point of the liquids in your body (saliva, tears, and moisture in your lungs) would drop below your body temperature. This would cause your soft tissues to swell.
• Asphyxiation: You would lose consciousness within 10 to 15 seconds as your blood becomes deoxygenated. You would not be able to "hold your breath," as the expanding air in your lungs would rupture them.
• Temperature: You would not freeze immediately. Space is a vacuum, meaning it is an excellent insulator. You would lose heat very slowly through radiation, though eventually, you would freeze solid long after you had died from lack of oxygen.

2. The Navigation Nightmare
If you were lost with a functional suit and life support (e.g., drifting away from a spacecraft):

• Lack of Friction: In space, there is no air resistance to slow you down. If you are moving away from your ship, you will continue moving at that exact speed indefinitely unless you have a propulsion system (like a Manned Maneuvering Unit) to stop your momentum.
• The "Void" Problem: Without a fixed point of reference, it is incredibly difficult to determine if you are moving or if the stars are shifting. You would quickly lose your sense of orientation.

3. The Timeline of Survival
Your survival time is strictly dictated by your Consumables:

• Oxygen: Once your primary oxygen supply runs out, you have only minutes before hypercapnia (carbon dioxide poisoning) or asphyxiation sets in.
• Temperature Control: Even if you have oxygen, your suit’s batteries power the thermal regulation and CO2 scrubbers. Once the power dies, you would either overheat or freeze depending on whether you are in direct sunlight or the shadow of a planet.

4. The Psychological Toll
If you were somehow in a craft drifting through deep space, the "Overview Effect" would turn into a psychological nightmare. The absolute silence, the crushing isolation, and the knowledge that rescue is impossible due to the vast distances would likely lead to rapid cognitive decline and panic.

Summary:
Unless you are within range of a rescue mission, being "lost" in space is a terminal event. You would drift in a silent, cold vacuum until your life support systems failed, at which point your body would remain preserved in a state of mummification or freezing for millions of years, orbiting the center of the galaxy as a silent satellite.