모델스페이스? 그룹?

모델 스페이스가 뭔가요???
어떤객체가 서로 묶여있어 Explod로 깼는데 안깨져서 LIST를 찍어봤더니
아래처럼 나옵니다.
그리고 그룹이란게 뭔가요?? 블럭과는 또 다른건가요???
아무리 깨도 안깨집니다…. ㅠ


LIST 1192 found

                  LINE      Layer: “WIN”
                            Space: Model space
                   Color: 5 (blue)    Linetype: “BYLAYER”
                   Handle = 4b5aca
                   Group = *A747961
              from point, X=  2172394  Y=  -728113  Z=        0
                to point, X=  2175549  Y=  -728113  Z=        0
          Length =     3155,  Angle in XY Plane =      0
                  Delta X =     3155, Delta Y =         0, Delta Z =        0

                  LINE      Layer: “DOR”
                            Space: Model space
                   Color: 3 (green)    Linetype: “BYLAYER”
Linetype scaling =         1
                   Handle = 4b5a45
                   Group = *A747961
              from point, X=  2168674  Y=  -726543  Z=        0
                to point, X=  2168674  Y=  -714223  Z=        0
          Length =    12320,  Angle in XY Plane =     90
                  Delta X =        0, Delta Y =     12320, Delta Z =        0