Bigger Mass, Bigger Horizon
How does the radius of the event horizon change when you add mass to a black hole?
What is it increases
Nothing can escape from inside this boundary, not even light.
What is the event horizon
Light climbing out of gravity loses energy and shifts toward this color?
What is red
Gas spiraling into a black hole forms this hot, glowing structure?
What is accretion disc
Astronomers use this type of telescope to see through dust toward the galactic center?
What is infrared
If a black hole’s mass doubles, its event horizon radius does this?
What is doubles
The Schwarzschild radius is represented by this equation?
What is Rg = 2GM/c²
This effect stretches light to longer wavelengths as it leaves a black hole’s gravity?
What is gravitational redshift
Our Milky Way’s SMBH is this: active or quiet?
What is active
Sgr A* has a mass of about this many Suns?
What is 4 million
If the Sun became a black hole, its event horizon radius would be about this many km?
What is 3 km
True or false: a rocket with powerful enough engines can escape from inside the horizon
What is false
An astronaut near a black hole’s event horizon, where time runs twice as slow as on her ship, experiences one hour. This much time passes on the distant ship?
What is 2 hours
Galaxies whose SMBH is actively feeding on gas are called this?
What are active galaxies
The first direct observation of a SMBH was seen on the _ _ Telescope?
What is the Event Horizon Telescope
A black hole of 10 solar masses has an event horizon radius of about this many km?
This radius marks the distance from a black hole’s center at which the escape velocity equals the speed of light?
What is the Schwarzschild radius
AN astronaut sends one pulse of light per minute by her own clock for her one hour, so 60 pulses. Because time near the black hole runs twice as slow, the ship receives this many pulses during its first hour?
What is 30
Active galaxies look brightest face on because we look nearly down this?
What is the jet
Prof. Andrea Ghez leads the Galactic Center Group, which studies the supermassive black hole at our galaxy’s center, at this California university.
What is UCLA
Sgr A*’s horizon radius is about 12 million km, roughly this many times the Sun’s radius?
What is about 17 times
Because the event horizon captures light and its gravity bends the light passing nearby, astronomers see a dark zone about this many times bigger than the horizon itself?
What is twice as big
An astronaut hovers closer and closer to the event horizon, sending one pulse per minute by her clock. As she nears the horizon, the pulses arrive at the ship less and less often, and their frequency approaches this value?
What is zero?
Gas in an accretion disc heats up mainly because of this process?
What is fritcion
In 2020, Ghez and Genzel won the Nobel Prize for discovering this at the center of our galaxy?
What is a supermassive compact object