EAPS 105 hw 10

In Wikipedia, look up "Hubble Ultra-Deep Field" and answer this question: The Hubble Ultra-Deep Field (HUDF) is an image of a small region covering only one twenty-six-millionth of the total sky — equivalent to the area of a tennis ball viewed 110 meters away. The region chosen is one of the darkest patches of sky in any direction, i.e., very few stars from our own galaxy. How many galaxies are visible in the HUDF?

10,000

In Wikipedia, look up "TRAPPIST-1" and answer this question: How many planets in the TRAPPIST-1 system are potentially hospitable to life, having orbits in the star's habitable zone?

4

In Wikipedia, look up "Hot Jupiter" and answer the following question: What is a hot Jupiter?

A gas giant like Jupiter that orbits extremely close to its star.

In Wikipedia, look up "Methods of detecting exoplanets", read the intro and then scroll down to "Radial velocity", and answer the following question: To find exoplanets, how does the radial velocity detection method work?

A star with a planet will wobble in response to the planet's gravity, causing it to change the speed at which it moves toward or away from the Earth.

In Wikipedia, look up "Fermi paradox" and answer this question: The Fermi paradox is the conflict between the lack of clear, obvious evidence for extraterrestrial life and various high estimates for their existence. Which of the following are possible solutions to the Fermi Paradox?

All the above

In Wikipedia, look up "James Webb Space Telescope" and answer the following question: The James Webb Space Telescope to succeeds the Hubble Space Telescope. In what ways is the James Webb Space Telescope superior to the Hubble Space Telescope?

All the above

In Wikipedia, look up "Lava planet" and answer the following question: Which situations might generate a lava planet?

All the above

In Wikipedia, look up "Super-Earth" and answer the following question: What is a super-Earth?

An exoplanet with a mass higher than Earth's, but substantially below those of an ice giant.

In Wikipedia, look up "Methods of detecting exoplanets", read the intro and then scroll down to "Direct imaging", and answer the following question: To find exoplanets, how does the direct imaging detection method work?

Blocking the light of a star reveals the reflected light of orbiting planets.

In Wikipedia, look up "Circumstellar habitable zone" and answer this question: If a star is much larger/brighter than our Sun, where will the habitable zone be located relative to our Sun's habitable zone?

Farther from the larger/brighter star.

In Wikipedia, look up "Drake equation" and answer this question: What does the Drake equation calculate?

How many active, communicative extraterrestrial civilizations in our galaxy.

In Wikipedia, look up "Methods of detecting exoplanets", read the intro and then scroll down to "Transit photometry", and answer the following question: To find exoplanets, how does the transit detection method work?

If a planet crosses in front of its parent star, then the observed visual brightness of the star drops by a small amount.

In Wikipedia, look up "Proxima Centauri b" and answer this question: What is so special about the exoplanet Proxima Centauri b?

It is the closest Earth-like exoplanet to our Solar System we will ever find.

In Wikipedia, look up "Nancy Grace Roman Space Telescope" and answer the following question: The Wide-Field Infrared Survey Telescope or WFIRST, now named after the former NASA Chief of Astronomy, provides a significant improvement over the Hubble Space Telescope in what manner?

It will have 100 times the imaging field of view.

In Wikipedia, look up "Earth Similarity Index" and answer this question: The Earth Similarity Index (ESI) characterizes how similar an exoplanet is to Earth. It has a scale from zero to one, with Earth having a value of one. Which of the following factors does the ESI not consider?

The exoplanet magnetic field

In Wikipedia, look up "Doppler effect" and answer the following question: With the Doppler effect, what changes when there is relative motion between the source of a wave and the observer?

The frequency of the wave

In Wikipedia, look up "Methods of detecting exoplanets", read the intro and then scroll down to "Gravitational microlensing", and answer the following question: To find exoplanets, how does the gravitational microlensing detection method work?

The gravitational field of a star acts like a lens, magnifying the light of a distant background star. If a planet is orbiting the foreground lensing star, it will make a detectable contribution to the lensing effect

In Wikipedia, look up "Methods of detecting exoplanets", read the intro and then scroll down to "Gravitational microlensing", and answer the following question: What is the notable disadvantage of the gravitational microlensing method?

The lensing observation cannot be repeated

In Wikipedia, look up "Methods of detecting exoplanets", read the intro and then scroll down to "Radial velocity", and answer the following question: What can only be determined by combining observations from the radial velocity method with observations from the transit detection method?

The mass of the exoplanet

In Wikipedia, look up "Methods of detecting exoplanets", read the intro and then scroll down to "Transit photometry", and answer the following question: Which of the following are weaknesses of the transit detection method?

d. All the above