When a fast solar wind stream erupts from a coronal hole (a cooler region in the Sun's atmosphere) and overtakes a slower moving solar wind stream, a stream interaction region (SIR) can form. In the SIR, a density "pileup" of compressed plasma develops upstream of the interface; typically there is a peak in pressure followed by a rarefaction region in the fast solar wind component. As the SIR propagates away from the Sun, to distances of one astronomical unit or beyond, the compression can form a shock that efficiently accelerates charged particles.
L3Harris announced Sept. 20 that the Space Development Agency has approved the company’s proposed design for a missile tracking satellite.
It seems like every week, another rocket is launched into space carrying rovers to Mars, tourists or, most commonly, satellites. The idea that "space is getting crowded" has been around for a few years now, but just how crowded is it? And how crowded is it going to get?
I am a professor of physics and director of the Center for Space Science and Technology at the University of Massachusetts, Lowell. Many satellites that were put into orbit have gone dead and burned up in the atmosphere, but thousands remain.
For a team of scientists and technicians from Europe and the US, the fact of ‘going back to the office’ this September has meant heading off to the Cabo Verde islands in the Atlantic – not to extend their summer holidays, but for a complex international experiment campaign that will scrutinise the data being delivered by one of today’s most innovative Earth observation satellites: ESA’s Aeolus wind mission.
A draft environmental assessment released by the Federal Aviation Administration suggests that SpaceX will be able to proceed with orbital Starship launches from Texas, but with a number of mitigations required.
The growing number of satellites in orbit is leading to calls to develop formal “right of way” rules, although there is no consensus on what those rules should be and how they should be established.
Four SpaceX tourists returned to Earth safely on Saturday after spending three days in space, successfully concluding the first orbital mission in history with no professional astronauts on board. The SpaceX Dragon capsule, whose heat shield allowed it to withstand descent, was slowed down by four large parachutes before splashing into the Atlantic Ocean off the coast of Florida at 7:06 pm (
The combination of the Tianzhou-3 cargo spacecraft and a Long March-7 Y4 carrier rocket has been transferred to the launching area of the Wenchang Spacecraft Launch Site, the China Manned Space Agency (CMSA) said Thursday. The CMSA said the Tianzhou-3 cargo spacecraft will be launched in the near future at an appropriate time. The facilities and equipment at the Wenchang Spacecraft L
NASA's Ingenuity Mars Helicopter provided a 3D view of a rock-covered mound during its 13th flight on Sept. 4. The plan for this reconnaissance mission into the "South Seitah" region of Mars' Jezero Crater was to capture images of this geologic target - nicknamed "Faillefeu" (after a medieval abbey in the French Alps) by the agency's Perseverance rover team - and to obtain the color pictures fro
The ground stations and tracking antennas the U.S. military relies on to communicate with its satellites — known as the Satellite Control Network, or SCN — are decades old and short of the capacity needed to keep up with the projected growth in space activities.
SpaceX’s first private crewed mission ended with the splashdown of the Crew Dragon spacecraft off the Florida coast Sept. 18.
Just after 8 p.m. EST on Sept. 15, 2021, the next batch of space tourists lifted off aboard a SpaceX rocket. Organized and funded by entrepreneur Jared Isaacman, the Inspiration4 mission touts itself as "the first all-civilian mission to orbit" and represents a new type of space tourism. The four crew members are not the first space tourists this year. In the past few months, the world wit