Editing 1887: Two Down, One to Go
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.
The edit can be undone.
Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
Latest revision | Your text | ||
Line 31: | Line 31: | ||
* This particular ''aurora borealis'' happened because the coronal mass ejection (CME) headed directly toward Earth causing Northern Lights spreading more south than common. That solar flare was first detected by the {{w|Solar Dynamics Observatory|Solar Dynamics Observatory (SDO)}} just eight minutes after it happened at the Sun. This [https://www.nasa.gov/feature/goddard/2017/nasa-s-sdo-captures-image-of-mid-level-flare animation] shows what the probe SDO has seen on Sept. 4, 2017 in the early evening. While light, and x-rays as well, travel at light speed the mass ejected did only move at a speed of 500-1,000 km/s. It was [http://www.swpc.noaa.gov/news/shock-arrival-6-sep-2308-utc-4-september-cme first detected] by {{w|Deep Space Climate Observatory|DSCOVR}} two days later, still 1,5 Mio. to reach Earth or just 30 minutes before the --non critical-- impact. And at this [http://www.swpc.noaa.gov/news/g3-watch-7-through-9-september-2017-due-cme-effects aurora forecast] the prediction showed that the northern United States were lucky. | * This particular ''aurora borealis'' happened because the coronal mass ejection (CME) headed directly toward Earth causing Northern Lights spreading more south than common. That solar flare was first detected by the {{w|Solar Dynamics Observatory|Solar Dynamics Observatory (SDO)}} just eight minutes after it happened at the Sun. This [https://www.nasa.gov/feature/goddard/2017/nasa-s-sdo-captures-image-of-mid-level-flare animation] shows what the probe SDO has seen on Sept. 4, 2017 in the early evening. While light, and x-rays as well, travel at light speed the mass ejected did only move at a speed of 500-1,000 km/s. It was [http://www.swpc.noaa.gov/news/shock-arrival-6-sep-2308-utc-4-september-cme first detected] by {{w|Deep Space Climate Observatory|DSCOVR}} two days later, still 1,5 Mio. to reach Earth or just 30 minutes before the --non critical-- impact. And at this [http://www.swpc.noaa.gov/news/g3-watch-7-through-9-september-2017-due-cme-effects aurora forecast] the prediction showed that the northern United States were lucky. | ||
β | * Betelgeuse is estimated to be in a range between 613 and 881 {{w|light-year}}s from Earth, which means that its light takes more than 600 years to reach Earth. That incident must have already happened when it should reach us in the next few decades. But since all information cannot travel faster than light{{ | + | * Betelgeuse is estimated to be in a range between 613 and 881 {{w|light-year}}s from Earth, which means that its light takes more than 600 years to reach Earth. That incident must have already happened when it should reach us in the next few decades. But since all information cannot travel faster than light{{Citation needed}} there is no way to find this out. |
* Something about the brightness of celestial objects: | * Something about the brightness of celestial objects: | ||
** The Sun is the brightest object at a {{w|Apparent magnitude|magnitude}} of β26.74 | ** The Sun is the brightest object at a {{w|Apparent magnitude|magnitude}} of β26.74 |