structure of stars
The collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
What is the Solar System?
A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
What is a nebula
the magnitude of a celestial object as it is actually measured from the earth.
What is apparent magnitude?
2 or more stars are called
what is a star system
roygbiv is a acronym for
what is a visible spectrum?
A celestial body moving in an elliptical orbit around a star.
What is a Planet?
A small very dense star that is typically the size of a planet.
What is a White dwarf?
the intrinsic brightness of a celestial object (as distinct from its apparent brightness diminished by distance).
what is luminosity?
brighter than the sun
what is every other star?
shortest electromagnetic radiation
what is raido wave?
A fixed luminous point in the night sky which is a large, remote incandescent body like the sun.
What is a Star?
A star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
What is a supernova?
the magnitude (brightness) of a celestial object as it would be seen at a standard distance of 10 parsecs.
what is absolute magnitude?
three types of galaxies
what is spiral,elliptical and irregular?
2 main types of telescopes
what is refracting and reflecting?
A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
What is a Galaxy?
a celestial object of very small radius (typically 18 miles/30 km) and very high density, composed predominantly of closely packed neutrons.
What is a Neutron star?
standard unit that astronimers use to mesure the size of stars
What is solar radii
what is our galaxy called
what is the milky way?
optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified.
what is a telescope
A unit of astronomical distance equivalent to the distance that light travels in one year.
What is a Light year?
any star that is fusing hydrogen in its core and has a stable balance of outward pressure from core nuclear fusion and gravitational forces pushing inward.
what is the main sequence?
Made of hydrogen and helium.
What is a star?
when 2 galaxies merge
what is a galactic merger?
what is a space telescope