One nucleus in NGC 4490 is visible in the optical wavelengths, while the other is only visible at infrared and radio wavelengths, according to a new study to be published in the Astrophysical Journal. This Hubble image shows the galaxy NGC 4490. Image credit: NASA / ESA / Hubble / D. Calzetti, UMass / LEGUS Team / J. Maund, University of Sheffield / R. Chandar, University of Toledo. NGC 4490 lies some 30 million light-years away in the constellation...