Galaxies
What is the Milky Way?
Answer: The Milky Way is the galaxy that contains our Solar System.
What is a nebula?
Answer: A nebula is a giant cloud of gas and dust in space, often the birthplace of stars.
What is wavelength?
Answer: Wavelength is the distance between successive crests of a wave, commonly used to describe electromagnetic radiation.
What is gravity?
Gravity is the force that attracts two bodies towards each other, proportional to their masses.
What are spectral lines?
Answer: Spectral lines are dark or bright lines in a spectrum caused by the absorption or emission of light at specific wavelengths.
What type of galaxy is Andromeda?
Answer: Andromeda is a spiral galaxy.
What are the stages of a star's life cycle?
Answer: The stages include nebula, main sequence, red giant, supernova, and either neutron star or black hole.
What are the types of radiation?
Answer: The types include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
How does gravity affect star motion?
Answer: Gravity governs the orbits of stars within galaxies and influences their movement.
How do scientists identify elements in stars?
Answer: Scientists analyze the spectrum of light from stars to identify specific spectral lines that correspond to different elements.
How do galaxies form?
Answer: Galaxies form from the gravitational attraction of gas and dust, which coalesces into stars and clusters.
What happens during a supernova?
Answer: A supernova is a powerful explosion that occurs at the end of a star's life cycle, dramatically increasing its brightness.
What colors are in the visible spectrum?
Answer: The visible spectrum includes red, orange, yellow, green, blue, indigo, and violet.
What is gravitational pull?
Answer: Gravitational pull is the force exerted by a mass, attracting other masses towards it.
What does spectrum analysis tell us about star composition?
Answer: Spectrum analysis reveals the elements present in a star and their relative abundances.
What is the age of the universe?
Answer: The universe is approximately 13.8 billion years old.
What is a white dwarf?
Answer: A white dwarf is the remnant core of a star that has exhausted its nuclear fuel and shed its outer layers.
What has the longest wavelength?
Answer: Radio waves have the longest wavelength in the electromagnetic spectrum.
What role does gravity play in galaxy formation?
Answer: Gravity pulls matter together, forming stars and galaxies from gas and dust.
What is redshift?
Answer: Redshift is the phenomenon where light from an object moving away from us is shifted to longer wavelengths.
What are the characteristics of elliptical galaxies?
Answer: Elliptical galaxies are smooth and featureless, with a more rounded shape and older stars.
What is a black hole?
Answer: A black hole is a region in space where gravity is so strong that nothing, not even light, can escape from it.
How does the spectrum of a distant star differ from that of the Sun?
Answer: The spectrum of a distant star can show redshift or blueshift, indicating its movement relative to Earth.
How does gravity affect satellite B?
Answer: If forces acting on satellite B become unbalanced, it could change its orbit or lead to its collision with another body.
What is the significance of blue shift?
Answer: Blue shift indicates that an object is moving towards us, causing its light to shift to shorter wavelengths.