A nebula (Latin for 'cloud' or 'fog'; pl. nebulae, nebulæ or nebulas) is a distinct body of interstellar clouds (which can consist of cosmic dust, hydrogen, helium, molecular clouds; possibly as ionized gases). … Edwin Hubble discovered that most nebulae are associated with stars and illuminated by starlight.
Is interstellar cloud and Nebula the same thing?
What is the difference between interstellar cloud and nebula?
We describe interstellar clouds in terms of their appearance and the state of the gas: Reflection nebula: cloud contains dust particles that can scatter star light. These nebulae look blue in color because blue light scatters better than red light. … Molecular cloud: cloud of gas and dust that is dense and cool.
What is another name for interstellar cloud?
Synonyms, crossword answers and other related words for INTERSTELLAR CLOUD OF GAS [nebula]
What is an interstellar gas cloud called?
molecular cloud, also called dark nebula, interstellar clump or cloud that is opaque because of its internal dust grains. The form of such dark clouds is very irregular: they have no clearly defined outer boundaries and sometimes take on convoluted serpentine shapes because of turbulence.
What is meant by interstellar clouds?
An interstellar cloud is generally an accumulation of gas, plasma, and dust in our and other galaxies. Put differently, an interstellar cloud is a denser-than-average region of the interstellar medium (ISM), the matter and radiation that exists in the space between the star systems in a galaxy.
What makes up most of interstellar matter?
Approximately 99% of the interstellar medium is composed of interstellar gas, and of its mass, about 75% is in the form of hydrogen (either molecular or atomic), with the remaining 25% as helium.
Why do nebulae near hot stars look red?
Nebulae near Hot stars look red because they absorb radiation and they emit a red color. Nebulae near Dust clouds look blue because the dust grain present in them scatters light from the nearest star and it looks blue because of their size.
What is meant by solar nebula?
The solar nebula was the rotating, flattened disk of gas and dust from which the solar system originated ∼4.6 Ga (Figure 1). … Artist's concept of the solar nebula, showing the early Sun surrounded by a flattened disk of gas, dust, and growing planetesimals.
What is the primary visible color of an emission nebula?
Due to the prevalence of hydrogen in interstellar gas, and its relatively low energy of ionization, many emission nebulae appear red due to the strong emissions of the Balmer series. If more energy is available, other elements will be ionized and green and blue nebulae become possible.