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How do we know the universe is expanding?
The universe's expansion is observed through the redshift of light from distant galaxies. Edwin Hubble discovered that galaxies are moving away from us, and their light is redshifted, meaning the wavelengths are stretched. This is evidence of an expanding universe.
The universe’s expansion is observed through the redshift of light from distant galaxies. Edwin Hubble discovered that galaxies are moving away from us, and their light is redshifted, meaning the wavelengths are stretched. This is evidence of an expanding universe.
See lessWhat are the main types of galaxies?
The main types of galaxies are spiral, elliptical, and irregular: Spiral galaxies: Look like giant pinwheels, with arms made of gas, dust, and stars. The Milky Way is a large barred spiral galaxy. Elliptical galaxies: Shaped like stretched-out circles, or ellipses. Some elliptical galaxies are almosRead more
The main types of galaxies are spiral, elliptical, and irregular:
See lessSpiral galaxies: Look like giant pinwheels, with arms made of gas, dust, and stars. The Milky Way is a large barred spiral galaxy.
Elliptical galaxies: Shaped like stretched-out circles, or ellipses. Some elliptical galaxies are almost perfectly circular.
Irregular galaxies: Don’t have a single common shape.
What is the role of gravity in space?
Gravity is the force that attracts objects with mass toward each other. It governs the motion of planets around stars, the formation of galaxies, the orbits of moons, and the interactions between cosmic objects.
Gravity is the force that attracts objects with mass toward each other. It governs the motion of planets around stars, the formation of galaxies, the orbits of moons, and the interactions between cosmic objects.
See lessHow are galaxies formed?
Galaxies are formed from large clouds of gas and dust that collapse under gravity. Over time, these clouds clump together, forming stars, which then group into galaxies. Galactic collisions and mergers also play a role in their formation and evolution.
Galaxies are formed from large clouds of gas and dust that collapse under gravity. Over time, these clouds clump together, forming stars, which then group into galaxies. Galactic collisions and mergers also play a role in their formation and evolution.
See lessHow does a neutron star form?
A neutron star forms from the remnants of a supernova explosion of a massive star. When the core collapses, protons and electrons combine to form neutrons, resulting in an extremely dense object composed mostly of neutrons
A neutron star forms from the remnants of a supernova explosion of a massive star. When the core collapses, protons and electrons combine to form neutrons, resulting in an extremely dense object composed mostly of neutrons
See lessWhat is dark energy?
Dark energy is a mysterious force that is driving the accelerated expansion of the universe. It makes up about 68% of the universe and its nature remains one of the biggest questions in cosmology.
Dark energy is a mysterious force that is driving the accelerated expansion of the universe. It makes up about 68% of the universe and its nature remains one of the biggest questions in cosmology.
See lessHow do we detect black holes if they don’t emit light?
Black holes are detected through their interactions with nearby matter. For example, if a black hole is pulling in material from a companion star or accreting matter from a surrounding disk, the material heats up and emits X-rays, which can be observed with telescopes.
Black holes are detected through their interactions with nearby matter. For example, if a black hole is pulling in material from a companion star or accreting matter from a surrounding disk, the material heats up and emits X-rays, which can be observed with telescopes.
See lessWhat is a comet?
A comet is a small celestial body made of ice, dust, and rocky material that develops a glowing coma and tail when it approaches the Sun.
A comet is a small celestial body made of ice, dust, and rocky material that develops a glowing coma and tail when it approaches the Sun.
See lessWhat is the closest galaxy to the Milky Way?
The Andromeda Galaxy is the closest spiral galaxy to the Milky Way.
The Andromeda Galaxy is the closest spiral galaxy to the Milky Way.
See lessWhat is the Event Horizon Telescope?
The Event Horizon Telescope is a network of radio telescopes that captured the first image of a black hole.
The Event Horizon Telescope is a network of radio telescopes that captured the first image of a black hole.
See less