How One Supernova Measured The Universe

The video explores the prediction and observation of a supernova in galaxy SP1149 using the Hubble Space Telescope. It delves into the concept of gravitational lensing, which allowed scientists to see multiple images of the same supernova. The video explains how time delays in light travel, due to general relativity, were used to predict the supernova's appearance. It also discusses the implications of these observations for measuring the universe's expansion rate, highlighting the discrepancy between different methods of calculating the Hubble constant.

What marks the end of a star's life cycle if it is more than eight times the mass of our sun?

• A black hole

• A supernova

• A white dwarf

• A neutron star

Why was the prediction of a supernova in Galaxy SP1149 significant?

• It was the first time a supernova was predicted using gravitational lensing.

• It was the first time a supernova was predicted using a telescope.

• It was the first time a supernova was observed in our galaxy.

• It was the first time a supernova was predicted.

What causes the multiple images of a supernova in gravitational lensing?

• The supernova's brightness

• The alignment of the telescope

• The gravitational lens between the source and observer

• The distance of the supernova

What is an Einstein ring?

• A ring of planets around a star

• A ring of galaxies in a cluster

• A ring of light formed by gravitational lensing

• A ring of stars around a black hole

What is the Shapiro effect related to?

• The bending of light by a black hole

• The delay of light due to gravitational fields

• The expansion of the universe

• The formation of galaxies

How did scientists predict the supernova would appear again in the host galaxy?

• By measuring the redshift of the galaxy

• By observing the cosmic microwave background

• By modeling the mass distribution and general relativity

• By using the Hubble Space Telescope

What is the Hubble constant used to measure?

• The brightness of stars

• The distance between galaxies

• The rate of expansion of the universe

• The mass of galaxies

What is the 'distance ladder' method?

• A method to observe the cosmic microwave background

• A method to determine the universe's expansion rate using known luminosity

• A method to calculate the mass of galaxies

• A method to measure the distance to nearby stars

What is the significance of the supernova Refstall?

• It confirmed the existence of dark matter

• It showed the universe is contracting

• It provided a new way to measure the Hubble constant

• It was the first supernova observed in our galaxy

What does the observation of multiple images of a supernova tell us about space?

• Space can warp light in complex ways

• Space is uniformly transparent

• Space is mostly empty

• Space is like a glass with slight distortions