Arm Tangents and the Spiral Structure of the Milky Way—The Age Gradient
Jacques P. Vallée

Int. J. Astron. Astrophys. Vol.11 No.4, October 27, 2021
DOI: 10.4236/ijaa.2021.114022

Relativistic Motion with Viscosity. I Newton’s Law of Resistance
Lorenzo Zaninetti

Int. J. Astron. Astrophys. Vol.11 No.3, September 24, 2021
DOI: 10.4236/ijaa.2021.113021

On the Development of a Simple and Portable Ground-Based Infrared Imaging System for Lunar and Atmospheric Studies
Abdullrahman Maghrabi, Georg Dittié, Abdulah Al-Dosari, Mohammed Al-Mutiri, Mohammed Al-Tlasi, Abdulah Alshehri

Int. J. Astron. Astrophys. Vol.11 No.3, September 24, 2021
DOI: 10.4236/ijaa.2021.113020

Optical Spectroscopic Monitoring Observations of a Young Binary Z CMa
Hinako Akimoto, Yoichi Itoh

Int. J. Astron. Astrophys. Vol.11 No.3, September 13, 2021
DOI: 10.4236/ijaa.2021.113019

Meridional Circulation with Latitude Bands of Long-Lived Cyclones in Jupiter’s Convective Atmosphere
Hans G. Mayr, Kwing L. Chan

Int. J. Astron. Astrophys. Vol.11 No.3, September 13, 2021
DOI: 10.4236/ijaa.2021.113018