Definition: A large cloud of gas and dust in space that is starting to develop into a galaxy.

Example: Astronomers study protogalaxies to understand how galaxies form and evolve over time.

Definition: A large object in space that is forming into a planet, created from smaller pieces that come together due to gravity.

Example: Scientists believe that protoplanets play a crucial role in the formation of solar systems.

Definition: Relating to the early stage of a planet's formation, before it becomes a fully developed planet.

Example: Scientists study protoplanetary disks to understand how planets form.

Definition: A cloud of gas and dust in space that is forming into a star and has not yet started nuclear fusion.

Example: Astronomers study protostars to understand how stars are born.

Definition: A type of star that sends out regular bursts of radio waves and other forms of energy, often thought to be a rapidly spinning neutron star.

Example: Astronomers discovered a new pulsar that emits signals every few milliseconds.

Definition: A very distant and powerful celestial object that emits a large amount of energy, appearing star-like but located far away in the universe.

Example: Astronomers study quasars to learn more about the early universe.

Definition: A change in the wavelength of light where the wavelength becomes longer than it was when it was emitted, often observed in celestial bodies moving away from the observer.

Example: Astronomers use redshift to determine how fast galaxies are moving away from us.

Definition: Describing light or other electromagnetic radiation that has been stretched to longer wavelengths, often due to the movement of an object away from the observer.

Example: The light from the distant galaxy appeared redshifted, indicating it was moving away from us.

Definition: The act of entering again or returning to a place or situation after having left it.

Example: The astronaut's reentry into the Earth's atmosphere was carefully planned.

Definition: To move quickly and powerfully upward, similar to how a rocket flies.

Example: The car rocketed down the highway, leaving all the other vehicles behind.

Definition: A vehicle or device that is powered by rocket engines, often used to travel into space or for fireworks.

Example: The scientists launched a rocket to explore the outer planets.

Definition: To launch or propel something into the air using a rocket or to move quickly and forcefully.

Example: The engineers decided to rocket the satellite into orbit.