Our Sun moves through a big cloud. 
Our Sun moves through a big space cloud. 
Our Sun moves through a big space cloud. This is the Local Interstellar Cloud. Some people call it the Local Fluff.
This cloud is part of a low-density region. We call this the Local Bubble. The cloud is warmer than most space. It has a temperature of about 6,000 Kelvin. That is like the surface of the Sun.
The cloud is not very thick. It has more hydrogen than the Local Bubble. It also has a strong magnetic field. This field helps the cloud stay together. Scientists found iron-60 in Antarctica. They think this came from the cloud.
The Sun helps protect Earth from the cloud. The Sun has a magnetic field. It also has a solar wind. These two things help block the cloud. A NASA tool called IBEX studies this. It maps the edge of our Solar System.
Our Sun is moving through a huge space cloud. This is called the Local Interstellar Cloud. Some people call it the Local Fluff.
This cloud works in a very interesting way. It has a temperature of about 6,000 Kelvin. This is about the same temperature as the Sun's surface. The cloud is not very thick or dense. Its density is 0.3 atoms per cubic centimeter. This is much less than the average in the Milky Way. However, it is six times denser than the Local Bubble.
Scientists have learned much about this cloud over time. In 2009, the Voyager 2 probe gave us new data. It showed the magnetic strength was higher than we thought. Before this, we thought it was 180 to 250 picoteslas. Now we know it is 370 to 550 picoteslas. In 2019, researchers found something special in Antarctica. They found iron-60 in the ice. They believe this iron came from the Local Interstellar Cloud.
There are many facts about our place in the cloud. The Sun entered the cloud within the last 10,000 years. We do not know if we are still inside it. We might be in a zone between this cloud and the G-Cloud. A new study says we will exit the cloud soon. This might happen in no more than 1,900 years. The cloud flows from the Scorpius-Centaurus association. This is a place where new stars are born.
You can think of the cloud like a thin mist. The Sun acts like a shield for us. The solar wind and the Sun's magnetic field protect Earth. They keep the cloud's effects away from our planet. A NASA satellite named IBEX helps us study this. IBEX maps the boundary of our solar system. It shows where we end and interstellar space begins.
The Local Interstellar Cloud, often called the Local Fluff, is a massive cloud of gas and dust. It is part of the Very Local Interstellar Medium. This medium is the region where our solar system ends and interstellar space begins. The cloud is located within the solar neighborhood. This area overlaps with the space surrounding our Sun.
Our solar system is currently traveling through this cloud. The Sun is located inside a larger structure called the Local Bubble. The Local Bubble is a region of very low density in the galaxy. Within this bubble, the Local Interstellar Cloud exists as an area of slightly higher hydrogen density. Scientists believe the Sun entered this cloud within the last 10,000 years. It is currently unclear if we are still inside the cloud. We might be in a transition zone between the Local Interstellar Cloud and the G-Cloud.
The cloud has very specific physical properties. Its temperature is approximately 6,000 Kelvin. This is roughly the same temperature as the surface of the Sun. However, the cloud has a very low specific heat capacity. This is because the cloud is not very dense. Its density is about 0.3 atoms per cubic centimeter. This is lower than the average density of the Milky Way. However, it is six times denser than the gas in the Local Bubble. To compare, Earth's atmosphere at 100 km above sea level has about 1.2 molecules per cubic centimeter. At 50 km, the density rises to about 50 million molecules per cubic centimeter.
Researchers have used various methods to study the cloud's history and movement. The cloud is flowing outward from the Scorpius–Centaurus association. This association is a stellar region where new stars are formed. The cloud moves roughly perpendicular to the direction of the Sun. In 2019, scientists found evidence of this cloud in Antarctica. They discovered interstellar iron-60 in the ice. They believe this iron is related to the Local Interstellar Cloud.
One of the most important discoveries involves the cloud's magnetism. In 2009, data from the Voyager 2 probe changed our understanding. The probe suggested the magnetic strength was much higher than expected. Previous estimates placed the strength between 180 and 250 picoteslas. The new data showed a range of 370 to 550 picoteslas. This magnetic strength is a key part of why the cloud exists. The strong magnetism may help the cloud survive against the pressures of the winds from the Local Bubble.
While the cloud is large, it does not directly affect Earth in a dangerous way. The solar wind and the Sun's magnetic field act as a shield. This interaction creates a boundary called the heliosphere. The heliosphere protects our planet from the direct effects of the interstellar medium. This boundary is a major focus of space science.
NASA is actively studying these boundaries using specialized technology. The Interstellar Boundary Explorer, or IBEX, is a satellite designed for this task. IBEX maps the boundary between our solar system and interstellar space. This helps scientists understand how the Sun interacts with its surroundings. Recent analyses suggest our time in the cloud is limited. The Sun may completely exit the Local Interstellar Cloud in no more than 1,900 years.
🖼️ Images & Media (2)
More to explore
✨ What else?
Related topics you might enjoy
🔬 Go deeper
More advanced topics to explore
What is Nepedia?
A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.