'Mega-Earth' which is 23 times more massive than our planet discovered

Astronomers have confirmed a ~170-million-year-old exoplanet which has 23.5 times Earth's mass but is only about 2.5 times wider. The exoplanet called GJ 523b is classified as a 'Mega-Earth' because of its unusually high density and little atmospheric gas despite its massive size. The planet completes a full orbit around its host star every 17.75 days.