Where the speed of light is constant, 7 letters
5-1 Dane will trespass, 6 letters
Attack, as across a boundary, 6 letters
Become an occupying force, 6 letters
Cross a border, perhaps, 6 letters
Enter forcibly, as a country, 6 letters
Enter with hostile intent, 6 letters
Intrude upon, as one's space, 6 letters
Intrude upon, as privacy, 6 letters
A driven trespasser, 7 letters
Asian lady beetle, for one, 7 letters
Martian in many a sci-fi story, 7 letters
Saxon or Celt, once, 7 letters
Villainous Venusian?, 7 letters
Someone who enters by force in order to conquer, 7 letters
Space ___ (arcade classic), 8 letters
H.G. Wells martians, e.g., 8 letters
Roy Thinnes TV series with The, 8 letters
Makes a strong entrance?, 7 letters
Attack the Falkland Islands' capital?, 13 letters
Fruitlessly: 2 wds., 6 letters
How Bob Marley waited, 6 letters
Like overused credit cards, 7 letters
Not worth the paper it's printed on, 7 letters
Someone who is incapacitated by a chronic illness or injury, 7 letters
Having incalculable worth, 10 letters
With regard to worth, 7 letters
Alloy of iron and nickel, 5 letters
(trademark) an alloy of iron and nickel having a low coefficient of thermal expansion, 5 letters
Used in tuning forks and measuring tapes and other instruments, 5 letters
It may be conformal, 10 letters
The quality of being resistant to variation, 10 letters
The act of invading, 8 letters
The act of an army that invades for conquest or plunder, 8 letters
Any entry into an area not previously occupied, 8 letters
Violating one's space, 8 letters
Threat to the ecosystem, 15 letters
The folding in of an outer layer so as to form a pocket in the surface, 12 letters
A formal termination (of a relationship or a judicial proceeding etc), 12 letters
Chronic ill health, 10 letters
The positive quality of being precious and beyond value, 14 letters
The quality of being resistant to variation, 13 letters