NASA’s Roman Mission Will Use Exploding Stars to Measure Cosmic Distances

Astronomers face challenges in measuring distances in the universe due to the similarity in appearance of galaxies at different distances. They use 'standard candles' like type 1a supernovae, which emit a known amount of light, to calculate distances. These supernovae involve white dwarfs in binary systems and are rare but observable across many galaxies. The upcoming Nancy Grace Roman Space Telescope will enhance the detection of these supernovae, improving distance measurement accuracy and contributing to a better understanding of the universe's expansion and evolution.

What challenge do astronomers face when determining distances in the universe?

• Light from galaxies is too faint to measure.

• Galaxies appear similar regardless of distance.

• Galaxies appear different at various distances.

• Galaxies move too quickly to track.

What is a 'standard candle' in astronomy?

• A type of telescope used for measuring distances.

• An object or event with a known light emission.

• A tool for mapping the universe.

• A method for calculating the age of stars.

What triggers a type 1a supernova?

• A collision between two galaxies.

• A star running out of fuel.

• A white dwarf reaching a mass tipping point.

• A black hole consuming a star.

How often do type 1a supernovae occur in the Milky Way?

• Once every 500 years.

• Once every 50,000 years.

• Once every 5,000 years.

• Once every 50 years.

What is the expected impact of the Nancy Grace Roman Space Telescope on supernova observation?

• It will significantly increase the number of observed supernovae.

• It will decrease the number of observed supernovae.

• It will only observe supernovae in the Milky Way.

• It will have no impact on supernova observation.