Spring 2021

"Zvaigžņotā Debess" The Starry Sky Spring 2021 (251) CONTENTS

ACTUALITIES
The news briefly. Ilgonis Vilks, Mārtiņš Gills, Karina Šķirmante. Page 2.
The revival of the noctilucent cloud archives. Jānis Kauliņš. Page 6.
Before and after conjunction. Mārtiņš Gills. Page 8.
The Aresibo radiotelescope collapsed. Raitis Misa. Page 10.

EXPLORING THE UNIVERSE
Exploration of space in the distant future. Dainis Draviņš, Ilgonis Vilks. Page 16.
Strangers in our Galaxy. Andis Zariņš. Page 24.

SOLAR SYSTEM
Bring stars down to Earth. Anna Gintere. Page 29.
Gold rush on the Moon. Tony Milligan, Martin Elvis, Alanna Krolikowski. Page 34.

ASTROSITE
Really tap the space. Mārtiņš Gills. Page 37.

MOBILE APP
Good time for observations. Mārtiņš Gills. Page 38.

OLYMPIC CHALLENGE
Solar and lunar eclipses. Prepared by Māris Krastiņš. Page 39.

SPACEFLIGHT
United Launch Alliance – a trusted spaceflight partner. Raitis Misa. Page 40.

SCIENTIFIC ACHIEVEMENTS
The 237th Conference of the American Astronomical Society. Juris Freimanis. Page 46.

PHOTO STORY
Little Pinwheel. Sergejs Klimanskis. Page 52.

AMATEUR ASTRONOMY
Results of the 2020 astrophoto contest. Anna Gintere. Page 54.
Compact Eagle. Mārtiņš Gills. Page 58.

OVERVIEW OF THE SKY
Celestial bodies in the spring of 2021. Juris Kauliņš. Page 60.