A high-contrast coronagraph for direct imaging of an Earth-like exoplanet at the visible band needs a contrast of 10-10 at a small angular separation of 4λ/D o
We present a comprehensive study of the H II region IC 1396 and its star forming activity, in which multi-wavelength data ranging from the optical to the near-a
Chandra observations of 17 nearby galaxies were analyzed and 166 bright sources with X-ray counts>100 were chosen for temporal analysis.Fractional root mean squ