The article examines the formation of planetary nebulae which occur during the final days of dying stars. According to the author, planetary nebulae are clouds of ionized gas that have fascinated backyard observers because of their brightness an...
Within these now-active nebulae, particles collide and start to form clumps. As these clumps accumulate more material, they grow in mass. Thanks to their own gravity, they pull in even more gas and dust from the surrounding star-forming region. Over a million years (give or take), these ...
Some nebulae, such as the Horsehead, are a real challenge to find and observe. Nebulae are best viewed under low magnification, and rich-field telescopes can provide good views. Large aperture telescopes can gather enough light to produce bright images, and light pollution filters may help you ...
Within M7 lies three other open clusters, a globular & at least 6 planetary nebulae - these are visible with "normal" scopes, no problem. What remains invisible to them & exclusively the realm of rich field scopes is the intricate lacework of dark nebulosity that criss crosses through it set...
The following image was taken at a mid-range focal length of 135mm. From this view, you can start to see individual deep-sky objects like globular clusters and nebulae appear. You can also distinguish the areas of dark interstellar dust blocking bright starlight. ...
and almost everything we discover about it only raises more questions. Although we are naturally drawn to the dramatic sights of supernovae, planetary nebulae, andconstellations in the night sky, the greatest mysteries of space are also on the chemical level. Indeed, far beyond our little blue...
What is the difference between nebulae and planetary nebulae? What does the temperature and composition of a star tell us? How does radio astronomy work? How does a protostar become a star? Edwin Hubble categorized galaxies according to their What is the difference between astronomy and planetary...
Planetary nebulae are the remains of sunlike stars that have reached the end of their red giant stage. Photo courtesy of NASA Sun-Earth Day 2010 The sun has been shining for about 4.5 billion years [source: NASA]. The size of the sun is a balance between the outward pressure ...
If you intend to take images of faint things such as nebulae and galaxies, low magnification powers are ideal. Medium-high powers are an excellent choice for bright objects such as planets and the moon. A tip for finding out the top useful magnification power of a telescope is multiplying th...
Electron energy transitions and ionization are the processes by which so-calledemission nebulaein space glow. Emission nebulae are oftenstar-forming regions, and are being ionized by the hard ultraviolet light from the young, massive starsborn within them. ...