Enemy Ships can disappear when are IN Sensor Range?

[waresky (OP)]

2 NPR's Ships.one r an HCG-Class 14700 tons and another (near to sure) an CLE-7800 Class,are 198millions away from mine ships..ive an Scout in follow route to my 2 CRURON at 200millions Km..the Main Scout's sensor range was 450 millions and r a perfect class-range to spot every ships over 1200 tons class...and happens this:
the NPR's ships reach a vicinity of a Solar System's SUN r vanguished..no sign,no noise,no thermal EM contact..PUF..1sec are..2 second later nothing.

What happens?

EDIT: dont worry,ive understand what damned make this Evil "Fox" minded NPR (STEEVE!!!:-D D)..this 2 tricky enemy use theh LP a very close a SUN position..before am no spotted.(must zoom in for show them...).grrrrrrrr:)))

NPR's sometimes r very tricky and evil tacticians

[Steve Walmsley]

2 NPR's Ships.one r an HCG-Class 14700 tons and another (near to sure) an CLE-7800 Class,are 198millions away from mine ships..ive an Scout in follow route to my 2 CRURON at 200millions Km..the Main Scout's sensor range was 450 millions and r a perfect class-range to spot every ships over 1200 tons class...and happens this:
the NPR's ships reach a vicinity of a Solar System's SUN r vanguished..no sign,no noise,no thermal EM contact..PUF..1sec are..2 second later nothing.

What happens?

EDIT: dont worry,ive understand what damned make this Evil "Fox" minded NPR (STEEVE!!!:-D D)..this 2 tricky enemy use theh LP a very close a SUN position..before am no spotted.(must zoom in for show them...

Steve