Solar prominences or filaments are cool and dense plasma structures suspended in the hot and tenuous corona.

Recent high-resolution solar limb observations reveal that some dark "bubbles" with bright arch-like boundaries form below prominences. It is puzzling that how these bubbles, semi-circular voids, form below dense prominences.

Ph.D. student Guo Yilin from National Astronomical Observatories of Chinese Academy of Sciences (NAOC), together with Dr. Hou Yijun, Dr. Li Ting, and Prof. Zhang Jun, found and investigated an on-disk bubble based on stereoscopic observations for the first time.

The study was published in the Astrophysical Journal Letters.

It is widely accepted that bubbles are closely related to the overlying prominence system and could eventually lead to the generation of a coronal mass ejection. This has serious effect on space weather.

"However, previous studies are all based on the solar limb observations or numerical simulations. If the bubble could be found on the solar disk, we could unveil the magnetic nature of the bubble," said Dr.

Jupiter's moon Europa has an icy crust covering a vast, global ocean. The rocky layer underneath may be hot enough to melt, leading to undersea volcanoes.

New research and computer modeling show that volcanic activity may have occurred on the seafloor of Jupiter's moon Europa in the recent past—and may still be happening. NASA's upcoming Europa Clipper mission, targeting a 2024 launch, will swoop close to the icy moon and collect measurements that may shed light on the recent findings.

A glittering full moon rose over New Zealand on Wednesday night as people there and around the world waited for a cosmic event known as a super blood moon.

It's when a full lunar eclipse coincides with a supermoon, which is when the moon is particularly close to Earth and appears brighter than normal.

For about 15 minutes, as the moon moves fully into Earth's shadow, the moon will appear to turn red.