Sunspots were first seen by Galileo, and in the eighteenth century Rudolf Wolf concluded from his study of previous observations that there was a roughly eleven-year solar cycle of activity. In 1919 the astronomer George ...
Space Exploration
Jan 11, 2021
0
37
The sun has entered its 25th solar cycle and is about to wake up. For the last few years our star has been pretty sleepy, with few sunspots, bright flares or massive ejections of magnetized plasma emanating from its surface. ...
Astronomy
Oct 30, 2020
1
557
In the past one and a half years, the sun has been rather dull: hardly a sunspot covered its surface, hardly a solar flare hurled radiation and particles into space. As observational data now show, for the last nine months ...
Astronomy
Sep 16, 2020
1
611
Solar Cycle 25 has begun. During a media event on Tuesday, experts from NASA and the National Oceanic and Atmospheric Administration (NOAA) discussed their analysis and predictions about the new solar cycle—and how the ...
Space Exploration
Sep 15, 2020
26
1718
Black holes are at the center of almost all galaxies that have been studied so far. They have an unimaginably large mass and therefore attract matter, gas and even light. But they can also emit matter in the form of plasma ...
Astronomy
Aug 21, 2020
42
5134
Solar activity varies in 11-year cycles. As the activity cycle switches to a new one, the Sun is usually very calm for several years.
Space Exploration
Aug 4, 2020
0
11
Extensive power outages and satellite blackouts that affect air travel and the internet are some of the potential consequences of massive solar storms. These storms are believed to be caused by the release of enormous amounts ...
Space Exploration
Jul 29, 2020
1
155
Very recently, Chinese researchers had achieved site- and spatial- selective integration of earth-abundant metal ions (e.g., Fe2+, Co2+, Ni2+) in semiconductor quantum dots (QDs) for efficient and robust photocatalytic H2 ...
Materials Science
Jul 7, 2020
0
6
Which way the wind blows in space has new importance for astronaut safety at the moon. Using data from several NASA missions, scientists discovered that wind created by high-speed particles from the sun can cause the tail ...
Space Exploration
Jun 30, 2020
2
136
Extreme space weather events can significantly impact systems such as satellites, communications systems, power distribution and aviation. They are driven by solar activity which is known to have an irregular but roughly ...
Space Exploration
Jun 10, 2020
1
266
