article_snippet: Having finally nailed down the elusive Higgs boson particle in 2013 -- the elementary particle that has unlocked some of the universe's longest-standing secrets -- physicists are now on the trail of dark matter.
article_snippet: Dark matter is currently a hypothesis.
article_snippet: It is a type of matter that can't be seen but whose presence can be inferred from It gravitational effects on visible matter, radiation and even the very structure of the universe.
article_snippet: Physicists believe this unseen material makes up about 85 percent of all the matter in the universe.
article_snippet: Regular matter, which we are made of along with all the stars, planets and other tangible cosmic material, accounts for just around 4 percent of the mass-energy of the known universe.
article_snippet: There are a number of theories that give you dark matter candidates --
highlights_snippet: After nailing down the elusive Higgs boson particle in 2013, physicists are now on the trail of dark matter .
  
highlights_snippet: Dark matter has never been observed, but Dark matter makes up nearly 85 percent of all the matter in the universe .